{"source":"gemini","id":"227887","ticker":"TENNIS-WTAUSO-20260903-OSA-SIN2","slug":"naomi-osaka-vs-katerina-siniakova","title":"Naomi Osaka vs Katerina Siniakova","description":"Naomi Osaka vs Katerina Siniakova","image":"https://assets.gemini.com/predictions/images/tennis_test_02_42aacd7e-073f-453c-a9a2-7f09d07bbc38.jpg","icon":null,"active":false,"closed":true,"start_date":"2026-09-02T01:57:38.643000Z","end_date":"2026-09-04T15:40:00Z","closed_time":"2026-09-03T17:53:30.543000Z","volume":3360.07,"volume_24hr":3358.85,"volume_24h_change":null,"normalized_vol_24hr":52.15826416015625,"normalized_volume":41.58992385864258,"liquidity":null,"open_interest":null,"categories":["Sports"],"tags":["US Open"],"synthetic":false,"is_group":false,"group_key":null,"parent_event_id":null,"probability":null,"spread":null,"top_outcome":"Naomi Osaka","top_outcome_probability":1.0,"top_outcome_prob_24h_change":0.20999999999999996,"top_outcome_volume_24h_change":null,"updated_at":"2026-09-03T18:08:46.301002Z","fetched_at":"2026-09-03T18:08:46.301002Z","added_at":"2026-09-02T02:17:27.040034Z","url":"https://www.gemini.com/predictions/TENNIS-WTAUSO-20260903-OSA-SIN2/naomi-osaka-vs-katerina-siniakova","chart_24h":[40.76,40.76,351.4,477.65,991.72,1029.59,1056.06,1156.96,3029.01,3358.85],"kind":"live","markets":[{"source":"gemini","id":"227887-550511","event_id":"227887","slug":"GEMI-TENNIS-WTAUSO-20260903-OSA-SIN2-OSA","question":"Naomi Osaka","group_item_title":"Naomi Osaka","description":"This market resolves to Yes if Naomi Osaka wins the tennis match between Naomi Osaka and Katerina Siniakova originally scheduled for September 3, 2026 at 11:00 AM ET. Otherwise, it will resolve to No. The Underlying is the official result of the specified sporting event. Source Agencies, in order, are the tournament governing body (ATP, WTA, ITF), ESPN, Fox Sports, and the broadcast partner of the event. If the Expiration Value cannot be determined on the Expiration Date (including because the event is cancelled or a player forfeits, withdraws, or is disqualified), the Exchange may determine payouts pursuant to the Market Outcome Review Process. View the [full rules](https://assets.gemini.com/predictions/terms_and_conditions/Sporting_Win_Lose_Event_2_Terms_and_Conditions_f232ede2-4e1a-4126-a1d7-89e0fa2225e2.pdf)","image":"https://images.ctfassets.net/jg6lo9a2ukvr/4J6VRr4hWCciq3hslGCXAK/d625172d9d6265bb9a8245301fe5bbcd/033-japan.png","icon":null,"outcomes":["Yes","No"],"outcome_prices":[1.0,0.0],"probability":1.0,"spread":0.01,"active":false,"closed":true,"start_date":"2026-09-03T05:00:00Z","end_date":"2026-09-04T15:40:00Z","closed_time":"2026-09-03T17:53:30.343000Z","volume":null,"volume_24hr":null,"prob_24h_change":0.20999999999999996,"volume_24h_change":null,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":null,"categories":["Sports"],"countries":[],"updated_at":"2026-09-03T18:08:46.306531Z","fetched_at":"2026-09-03T18:08:46.306531Z","added_at":"2026-09-02T02:17:27.288243Z","url":"https://www.gemini.com/predictions/TENNIS-WTAUSO-20260903-OSA-SIN2/naomi-osaka-vs-katerina-siniakova","event_title":"Naomi Osaka vs Katerina Siniakova","chart_24h":[0.79,0.8,0.79,0.79,0.79,0.79,0.78,0.78,0.93,0.99,0.93,1.0]},{"source":"gemini","id":"227887-550513","event_id":"227887","slug":"GEMI-TENNIS-WTAUSO-20260903-OSA-SIN2-SIN2","question":"Katerina Siniakova","group_item_title":"Katerina Siniakova","description":"This market resolves to Yes if Katerina Siniakova wins the tennis match between Katerina Siniakova and Naomi Osaka originally scheduled for September 3, 2026 at 11:00 AM ET. Otherwise, it will resolve to No. The Underlying is the official result of the specified sporting event. Source Agencies, in order, are the tournament governing body (ATP, WTA, ITF), ESPN, Fox Sports, and the broadcast partner of the event. If the Expiration Value cannot be determined on the Expiration Date (including because the event is cancelled or a player forfeits, withdraws, or is disqualified), the Exchange may determine payouts pursuant to the Market Outcome Review Process. View the [full rules](https://assets.gemini.com/predictions/terms_and_conditions/Sporting_Win_Lose_Event_2_Terms_and_Conditions_f232ede2-4e1a-4126-a1d7-89e0fa2225e2.pdf)","image":"https://images.ctfassets.net/jg6lo9a2ukvr/64GqAUITALgTJCEC2G02NY/fceaa8ede611cd68a94e0c79509adee7/061-czech-republic.png","icon":null,"outcomes":["Yes","No"],"outcome_prices":[0.0,1.0],"probability":0.0,"spread":0.01,"active":false,"closed":true,"start_date":"2026-09-03T05:00:00Z","end_date":"2026-09-04T15:40:00Z","closed_time":"2026-09-03T17:53:30.543000Z","volume":null,"volume_24hr":null,"prob_24h_change":-0.25,"volume_24h_change":null,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":null,"categories":["Sports"],"countries":[],"updated_at":"2026-09-03T18:08:46.306531Z","fetched_at":"2026-09-03T18:08:46.306531Z","added_at":"2026-09-02T02:17:27.288243Z","url":"https://www.gemini.com/predictions/TENNIS-WTAUSO-20260903-OSA-SIN2/naomi-osaka-vs-katerina-siniakova","event_title":"Naomi Osaka vs Katerina Siniakova","chart_24h":[0.25,0.25,0.25,0.24,0.24,0.25,0.24,0.23,0.1,0.03,0.08,0.0]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/gemini/227887","as_of":"2026-09-03T19:19:46.669768Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Gemini): \"Naomi Osaka vs Katerina Siniakova\" — top market at 100% probability across 2 outcomes","source_url":null}}