{"source":"polymarket","id":"863114","ticker":"wta-kostyuk-stephen-2026-08-18","slug":"wta-kostyuk-stephen-2026-08-18","title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\n\nThis market will resolve to 'Marta Kostyuk' if Marta Kostyuk advances against Sloane Stephens.\n\nThis market will resolve to 'Sloane Stephens' if Sloane Stephens advances against Marta Kostyuk.\n\nIf the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, this market will resolve to 50-50.\n\nIf the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances.\n\nIf the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50.\n\nThe primary resolution source will be official information from the WTA Tour. A consensus of credible reporting may also be used.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","active":true,"closed":false,"start_date":"2026-08-17T04:14:17Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":4207.753348,"volume_24hr":4207.753348,"volume_24h_change":null,"normalized_vol_24hr":28.43819808959961,"normalized_volume":15.859440803527832,"liquidity":99978.093,"open_interest":4114.511921,"categories":["Sports"],"tags":[{"id":"864","slug":"tennis","label":"Tennis"},{"id":"1","slug":"sports","label":"Sports"},{"id":"100639","slug":"games","label":"Games"}],"synthetic":false,"is_group":false,"group_key":null,"parent_event_id":null,"probability":null,"spread":null,"top_outcome":"","top_outcome_probability":0.865,"top_outcome_prob_24h_change":0.0,"top_outcome_volume_24h_change":3904.245888,"updated_at":"2026-08-17T20:38:18.137942Z","fetched_at":"2026-08-17T20:38:18.137942Z","added_at":"2026-08-17T04:32:56.980564Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18","chart_24h":[5.0,10.0,10.0,10.0,138.160915,138.160915,138.160915,138.160915,143.827576,205.006999,205.006999,205.006999,205.006999,205.006999,205.006999,503.514459,503.514459,4074.943029,4152.118714,4152.118714,4152.118714,4154.41756,4207.753348],"markets":[{"source":"polymarket","id":"3654464","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18","question":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","group_item_title":null,"description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\n\nThis market will resolve to 'Marta Kostyuk' if Marta Kostyuk advances against Sloane Stephens.\n\nThis market will resolve to 'Sloane Stephens' if Sloane Stephens advances against Marta Kostyuk.\n\nIf the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, this market will resolve to 50-50.\n\nIf the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances.\n\nIf the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50.\n\nThe primary resolution source will be official information from the WTA Tour. A consensus of credible reporting may also be used.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Marta Kostyuk","Sloane Stephens"],"outcome_prices":[0.865,0.135],"probability":0.865,"spread":0.01,"active":true,"closed":false,"start_date":"2026-08-17T04:14:18Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":3909.2458880000004,"volume_24hr":3909.245888,"prob_24h_change":0.0,"volume_24h_change":3904.245888,"normalized_vol_24hr":31.38163948059082,"normalized_volume":20.0725040435791,"liquidity":50390.3578,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T20:41:37.323449Z","fetched_at":"2026-08-17T20:38:18.193015Z","added_at":"2026-08-17T04:32:57.033228Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.865,0.83,0.835,0.845,0.85,0.845,0.855,0.86,0.865,0.865,0.865,0.865,0.865,0.865]},{"source":"polymarket","id":"3654874","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-set-handicap-home-1pt5","question":"Set Handicap: Kostyuk (-1.5) vs Stephens (+1.5)","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set Handicap +/-1.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Kostyuk\" if Marta Kostyuk wins by 2 or more sets than Sloane Stephens, based on the final completed score. Otherwise, it will resolve to \"Stephens.\"\nIf the match begins but is not completed, this market will resolve 50-50. If the match is canceled before play begins or delayed beyond 7 days from the scheduled date without a result, this market will also resolve 50-50.\nResolution will be based on official WTA results.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Kostyuk","Stephens"],"outcome_prices":[0.655,0.345],"probability":0.655,"spread":0.03,"active":true,"closed":false,"start_date":"2026-08-17T04:46:28Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":298.50746,"volume_24hr":298.50746,"prob_24h_change":0.15500000000000003,"volume_24h_change":298.50746,"normalized_vol_24hr":14.914129257202148,"normalized_volume":9.539461135864258,"liquidity":7585.0568,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T15:11:12.707083Z","fetched_at":"2026-08-17T15:08:35.785552Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-set-handicap-home-1pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.5,0.5,0.6,0.655,0.655]},{"source":"polymarket","id":"3654836","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-set-2-winner-Kostyuk-vs-Stephens","question":"Set 2 Winner: Kostyuk vs Stephens","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 2 Winner","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to “Kostyuk” if Marta Kostyuk wins set 2. It will resolve to “Stephens” if Sloane Stephens wins set 2.\nIf the match begins but set 2 is not completed with a winner determined (including the match ending before set 2 is reached), this market will resolve 50-50.\nIf the match is canceled (not played at all) or is delayed beyond 7 days from the scheduled date without play beginning, this market will resolve 50-50.\nResolution will be based on official WTA match statistics.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Kostyuk","Stephens"],"outcome_prices":[0.81,0.19],"probability":0.81,"spread":0.08,"active":true,"closed":false,"start_date":"2026-08-17T04:46:47Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":0.31000000000000005,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":2529.1754,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T20:39:27.811942Z","fetched_at":"2026-08-17T20:38:18.193015Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-set-2-winner-Kostyuk-vs-Stephens","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.5,0.5,0.79,0.79,0.78,0.79,0.785,0.785,0.78,0.675,0.79,0.815,0.82,0.81,0.81,0.81]},{"source":"polymarket","id":"3654840","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-first-set-winner-Kostyuk-vs-Stephens","question":"Set 1 Winner: Kostyuk vs Stephens","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 1 Winner","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to “Kostyuk” if Marta Kostyuk wins the first set. It will resolve to “Stephens” if Sloane Stephens wins the first set.\nIf the match begins but is not completed, and the first set is concluded with a winner determined, this market will resolve based on that completed set. If the first set is not completed for any reason, this market will resolve 50-50.\nIf the match is canceled (not played at all) or is delayed beyond 7 days from the scheduled date without play beginning, this market will resolve 50-50.\nResolution will be based on official WTA match statistics.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Kostyuk","Stephens"],"outcome_prices":[0.785,0.215],"probability":0.785,"spread":0.03,"active":true,"closed":false,"start_date":"2026-08-17T04:47:10Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":0.28500000000000003,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":8369.8522,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T12:57:05.448419Z","fetched_at":"2026-08-17T12:56:31.394446Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-first-set-winner-Kostyuk-vs-Stephens","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.5,0.5,0.78,0.78,0.77,0.77,0.78,0.785]},{"source":"polymarket","id":"3654859","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-first-set-total-8pt5","question":"Kostyuk vs. Stephens: Set 1 Games O/U 8.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 1 O/U 8.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of games completed in the first set equals or exceeds 9. Otherwise, it will resolve to \"Under.\"\nAny first-set tiebreak counts as one (1) game toward the total.\nIf the first set is not completed for any reason, this market will resolve 50-50. If the match is canceled before play begins, or delayed beyond 7 days without commencement, this market will also resolve 50-50.\nResolution will be based on official WTA results.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over","Under"],"outcome_prices":[0.59,0.41],"probability":0.59,"spread":0.06,"active":true,"closed":false,"start_date":"2026-08-17T04:46:54Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":0.09999999999999998,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":4457.0839,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T16:55:47.544121Z","fetched_at":"2026-08-17T16:55:00.292358Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-first-set-total-8pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.49,0.495,0.56,0.59,0.585,0.585,0.595,0.585,0.59,0.58,0.58,0.59]},{"source":"polymarket","id":"3654465","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-completed-match","question":"Cincinnati Open: Completed Match: Marta Kostyuk vs Sloane Stephens","group_item_title":"Completed Match","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET. This market will resolve to \"Yes\" if all games and sets required to determine a match winner under governing body or event organizer rules are played to completion through normal play. Otherwise, if the match is not completed for any reason, it will resolve to \"No.\" If a forfeit of any kind occurs, including but not limited to a walkover or retirement, this market will resolve \"No.\" If the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, this market will resolve to \"No.\" The primary resolution source for this market is the official statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 2 hours after the event's conclusion, a consensus of credible reporting may be used instead.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Yes","No"],"outcome_prices":[0.5,0.5],"probability":0.5,"spread":0.98,"active":true,"closed":false,"start_date":"2026-08-17T04:14:17Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":0.0,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":10.58,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T05:16:39.232614Z","fetched_at":"2026-08-17T04:32:57.033228Z","added_at":"2026-08-17T04:32:57.033228Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-completed-match","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.5,0.5]},{"source":"polymarket","id":"3654867","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-set-2-total-8pt5","question":"Kostyuk vs. Stephens: Set 2 Games O/U 8.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 2 O/U 8.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of games completed in set 2 equals or exceeds 9. Otherwise, it will resolve to \"Under.\"\nAny tiebreak in set 2 counts as one (1) game toward the total.\nIf set 2 is not completed for any reason (including the match ending before set 2 is reached), this market will resolve 50-50. If the match is canceled before play begins, or delayed beyond 7 days without commencement, this market will also resolve 50-50.\nResolution will be based on official WTA results.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over","Under"],"outcome_prices":[0.5,0.5],"probability":0.5,"spread":0.98,"active":true,"closed":false,"start_date":"2026-08-17T04:47:10Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":0.0050000000000000044,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":0.2,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T14:03:43.233458Z","fetched_at":"2026-08-17T14:02:30.232098Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-set-2-total-8pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.495,0.495,0.5]},{"source":"polymarket","id":"3654893","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-set-2-total-9pt5","question":"Kostyuk vs. Stephens: Set 2 Games O/U 9.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 2 O/U 9.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of games completed in set 2 equals or exceeds 10. Otherwise, it will resolve to \"Under.\"\nAny tiebreak in set 2 counts as one (1) game toward the total.\nIf set 2 is not completed for any reason (including the match ending before set 2 is reached), this market will resolve 50-50. If the match is canceled before play begins, or delayed beyond 7 days without commencement, this market will also resolve 50-50.\nResolution will be based on official WTA results.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over","Under"],"outcome_prices":[0.5,0.5],"probability":0.5,"spread":0.98,"active":true,"closed":false,"start_date":"2026-08-17T04:46:53Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":0.0050000000000000044,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":0.2,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T14:03:43.233458Z","fetched_at":"2026-08-17T14:02:30.232098Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-set-2-total-9pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.495,0.495,0.5]},{"source":"polymarket","id":"3654909","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-set-2-total-10pt5","question":"Kostyuk vs. Stephens: Set 2 Games O/U 10.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 2 O/U 10.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of games completed in set 2 equals or exceeds 11. Otherwise, it will resolve to \"Under.\"\nAny tiebreak in set 2 counts as one (1) game toward the total.\nIf set 2 is not completed for any reason (including the match ending before set 2 is reached), this market will resolve 50-50. If the match is canceled before play begins, or delayed beyond 7 days without commencement, this market will also resolve 50-50.\nResolution will be based on official WTA results.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over","Under"],"outcome_prices":[0.5,0.5],"probability":0.5,"spread":0.98,"active":true,"closed":false,"start_date":"2026-08-17T04:47:16Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":0.0050000000000000044,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":0.2,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T14:03:43.233458Z","fetched_at":"2026-08-17T14:02:30.232098Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-set-2-total-10pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.495,0.495,0.5]},{"source":"polymarket","id":"3654884","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-first-set-total-9pt5","question":"Kostyuk vs. Stephens: Set 1 Games O/U 9.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 1 O/U 9.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of games completed in the first set equals or exceeds 10. Otherwise, it will resolve to \"Under.\"\nAny first-set tiebreak counts as one (1) game toward the total.\nIf the first set is not completed for any reason, this market will resolve 50-50. If the match is canceled before play begins, or delayed beyond 7 days without commencement, this market will also resolve 50-50.\nResolution will be based on official WTA results.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over","Under"],"outcome_prices":[0.405,0.595],"probability":0.405,"spread":0.15,"active":true,"closed":false,"start_date":"2026-08-17T04:46:54Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.08499999999999996,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":1681.32,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T20:39:27.811942Z","fetched_at":"2026-08-17T20:38:18.193015Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-first-set-total-9pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.49,0.495,0.485,0.48,0.48,0.48,0.475,0.34,0.345,0.34,0.335,0.335,0.35,0.395,0.35,0.395,0.405,0.405]},{"source":"polymarket","id":"3654869","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-match-total-21pt5","question":"Kostyuk vs. Stephens: Match O/U 21.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Match O/U 21.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of games completed across all sets equals or exceeds 22. Otherwise, it will resolve to \"Under.\"\nAll tiebreaks—including any Champions/Super tiebreak—count as one (1) game toward the total.\nIf the match begins but is not completed, this market will resolve 50-50. If the match is canceled before play begins or delayed beyond 7 days from the scheduled date without a result, this market will also resolve 50-50.\nResolution will be based on official WTA statistics.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over","Under"],"outcome_prices":[0.35,0.65],"probability":0.35,"spread":0.1,"active":true,"closed":false,"start_date":"2026-08-17T04:46:53Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.14500000000000002,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":4611.2638,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T20:39:27.811942Z","fetched_at":"2026-08-17T20:38:18.193015Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-match-total-21pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.495,0.495,0.385,0.39,0.35,0.355,0.35,0.355,0.35,0.355,0.35]},{"source":"polymarket","id":"3654889","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-match-total-22pt5","question":"Kostyuk vs. Stephens: Match O/U 22.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Match O/U 22.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of games completed across all sets equals or exceeds 23. Otherwise, it will resolve to \"Under.\"\nAll tiebreaks—including any Champions/Super tiebreak—count as one (1) game toward the total.\nIf the match begins but is not completed, this market will resolve 50-50. If the match is canceled before play begins or delayed beyond 7 days from the scheduled date without a result, this market will also resolve 50-50.\nResolution will be based on official WTA statistics.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over","Under"],"outcome_prices":[0.315,0.685],"probability":0.315,"spread":0.07,"active":true,"closed":false,"start_date":"2026-08-17T04:46:49Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.18,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":4551.589,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T20:39:27.811942Z","fetched_at":"2026-08-17T20:38:18.193015Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-match-total-22pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.495,0.495,0.365,0.37,0.365,0.375,0.32,0.325,0.315]},{"source":"polymarket","id":"3654912","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-match-total-23pt5","question":"Kostyuk vs. Stephens: Match O/U 23.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Match O/U 23.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of games completed across all sets equals or exceeds 24. Otherwise, it will resolve to \"Under.\"\nAll tiebreaks—including any Champions/Super tiebreak—count as one (1) game toward the total.\nIf the match begins but is not completed, this market will resolve 50-50. If the match is canceled before play begins or delayed beyond 7 days from the scheduled date without a result, this market will also resolve 50-50.\nResolution will be based on official WTA statistics.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over","Under"],"outcome_prices":[0.28,0.72],"probability":0.28,"spread":0.08,"active":true,"closed":false,"start_date":"2026-08-17T04:46:49Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.21499999999999997,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":4279.3216,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T20:39:27.811942Z","fetched_at":"2026-08-17T20:38:18.193015Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-match-total-23pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.495,0.495,0.36,0.355,0.36,0.285,0.28]},{"source":"polymarket","id":"3654866","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-set-totals-2pt5","question":"Marta Kostyuk vs. Sloane Stephens: Total Sets O/U 2.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Total Sets: O/U 2.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of sets completed equals or exceeds 3. Otherwise, it will resolve to \"Under.\"\nA super tie breaker is considered as one (1) set for total set markets.\nIf the match begins but is not completed, this market will resolve 50-50. If the match is canceled before play begins or delayed beyond 7 days from the scheduled date without a result, this market will also resolve 50-50.\nResolution will be based on official WTA statistics.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over 2.5","Under 2.5"],"outcome_prices":[0.275,0.725],"probability":0.275,"spread":0.01,"active":true,"closed":false,"start_date":"2026-08-17T04:46:55Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.22499999999999998,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":7818.377,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T18:04:36.399923Z","fetched_at":"2026-08-17T18:03:41.512140Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-set-totals-2pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.5,0.5,0.29,0.275,0.27,0.275,0.27,0.275]},{"source":"polymarket","id":"3654904","event_id":"863114","slug":"wta-kostyuk-stephen-2026-08-18-first-set-total-10pt5","question":"Kostyuk vs. Stephens: Set 1 Games O/U 10.5","group_item_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 1 O/U 10.5","description":"This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET.\nThis market will resolve to \"Over\" if the total number of games completed in the first set equals or exceeds 11. Otherwise, it will resolve to \"Under.\"\nAny first-set tiebreak counts as one (1) game toward the total.\nIf the first set is not completed for any reason, this market will resolve 50-50. If the match is canceled before play begins, or delayed beyond 7 days without commencement, this market will also resolve 50-50.\nResolution will be based on official WTA results.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/wta-logo-41f331bdf1.png","outcomes":["Over","Under"],"outcome_prices":[0.18,0.82],"probability":0.18,"spread":0.06,"active":true,"closed":false,"start_date":"2026-08-17T04:47:17Z","end_date":"2026-08-25T14:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.31,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":2629.4981,"categories":["Sports"],"countries":[],"updated_at":"2026-08-17T20:39:27.811942Z","fetched_at":"2026-08-17T20:38:18.193015Z","added_at":"2026-08-17T04:54:00.645182Z","url":"https://polymarket.com/event/wta-kostyuk-stephen-2026-08-18/wta-kostyuk-stephen-2026-08-18-first-set-total-10pt5","event_title":"Cincinnati Open: Marta Kostyuk vs Sloane Stephens","chart_24h":[0.49,0.495,0.185,0.19,0.185,0.19,0.19,0.18,0.18,0.18,0.175,0.175,0.18,0.18]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/863114","as_of":"2026-08-17T20:52:20.536864Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"Cincinnati Open: Marta Kostyuk vs Sloane Stephens\" — top market at 86% probability across 15 outcomes","source_url":null}}