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| Outcome | Chance | 24h | 1 week | Bid · Ask | 24h volume | Ends |
|---|---|---|---|---|---|---|
| US Open WTA: Naomi Osaka vs Katerina Siniakova | 100% | +23 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Game Spread +/-4.5 | 100% | −2 pts | — | — · 100¢ | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Set 2 Winner | 0% | −52 pts | — | 15¢ · 24¢ (9¢) | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Set Handicap +/-1.5 | 0% | −41 pts | — | — · 25¢ | — | ended |
| Completed Match | 100% | — | — | — · 100¢ | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Match O/U 21.5 | 100% | +38 pts | — | 70¢ · 100¢ (30¢) | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Total Sets: O/U 2.5 | 100% | +16 pts | — | — · 100¢ | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Match O/U 22.5 | 100% | +7 pts | — | — · 98¢ | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Set 1 Winner | 100% | +28 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Set 2 O/U 8.5 | 100% | +41 pts | — | 81¢ · 100¢ (19¢) | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Set 1 O/U 8.5 | 0% | −67 pts | — | — · <1¢ | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Set 2 O/U 9.5 | 100% | +41 pts | — | 81¢ · 100¢ (19¢) | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Set 1 O/U 9.5 | 0% | −46 pts | — | — · <1¢ | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Set 2 O/U 10.5 | 100% | +40 pts | — | 80¢ · 100¢ (20¢) | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Set 1 O/U 10.5 | 0% | −25 pts | — | — · <1¢ | — | ended |
| US Open WTA: Naomi Osaka vs Katerina Siniakova Match O/U 23.5 | 100% | +9 pts | — | — · 98¢ | — | ended |
| When | Trader | Outcome | Bet | Size | P&L now | Insider |
|---|---|---|---|---|---|---|
| 50d | Exalted-Evocation | US Open WTA: Naomi Osaka vs Katerina Siniakova | SellNaomi Osaka>99¢ | $5,438 | −$5 −0.1% | — |
| 50d | Skogeru | US Open WTA: Naomi Osaka vs Katerina Siniakova | SellNaomi Osaka>99¢ | $3,810 | −$4 −0.1% | — |
| 50d | ford12345 | US Open WTA: Naomi Osaka vs Katerina Siniakova | SellNaomi Osaka>99¢ | $1,263 | −$1 −0.1% | — |
| 50d | Skogeru | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka80¢ → 100¢ | $3,068 | +$746 +24% | 5 |
| 50d | ford12345 | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka90¢ → 100¢ | $1,137 | +$128 +11% | 5 |
| 50d |  hd7772 fills | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka99¢ → 100¢ | $25,466 | +$257 +1.0% | 4 |
| 50d | SplendidAmadeus | US Open WTA: Naomi Osaka vs Katerina Siniakova | SellNaomi Osaka96¢ → 100¢ | $1,493 | −$62 −4.2% | — |
| 50d | HomeRunHazard | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka95¢ → 100¢ | $1,985 | +$104 +5.3% | 4 |
| 51d | Mad-Wound | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka95¢ → 100¢ | $2,200 | +$116 +5.3% | 4 |
| 51d | riitmo | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka95¢ → 100¢ | $1,307 | +$69 +5.3% | 4 |
| 51d | jtwyslljy | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyKaterina Siniakova6¢ → 0¢ | $1,272 | −$1,272 −100% | 6 |
| 51d | Flaznorp5 fills | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka91¢ → 100¢ | $14,251 | +$1,484 +10% | 5 |
| 51d |  tradecraft | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka87¢ → 100¢ | $1,840 | +$275 +15% | 5 |
| 51d | SplendidAmadeus | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka79¢ → 100¢ | $1,228 | +$327 +27% | 5 |
| 51d | Exalted-Evocation | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka79¢ → 100¢ | $4,300 | +$1,143 +27% | 5 |
| 51d | Caonima1 | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka79¢ → 100¢ | $1,100 | +$292 +27% | 5 |
| 51d | comon119 | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyKaterina Siniakova22¢ → 0¢ | $2,200 | −$2,200 −100% | 6 |
| 51d | ferrariChampions2026 | US Open WTA: Naomi Osaka vs Katerina Siniakova | BuyNaomi Osaka78¢ → 100¢ | $7,910 | +$2,231 +28% | 5 |
This market refers to the tennis match between Naomi Osaka and Katerina Siniakova in the US Open WTA, originally scheduled for September 2, 2026 at 11:00AM ET. This market will resolve to 'Naomi Osaka' if Naomi Osaka advances against Katerina Siniakova. This market will resolve to 'Katerina Siniakova' if Katerina Siniakova advances against Naomi Osaka. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 16, 2026, 11:59 PM ET (14 days after the scheduled start), this market will resolve to 50-50. If 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. If the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50. The primary resolution source will be official information from the WTA Tour. A consensus of credible reporting may also be used.
Sources: Polymarket's Gamma API, its CLOB price history and its Data API, read every two minutes. Prices are each outcome's Yes price, which is the market's probability: 100¢ for US Open WTA: Naomi Osaka vs Katerina Siniakova means the market gives it about 100%.