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| Outcome | Chance | 24h | 1 week | Bid · Ask | 24h volume | Ends |
|---|---|---|---|---|---|---|
| Japan Women's Open: Katie Boulter vs Katerina Siniakova | 0% | — | — | — · <1¢ | $127K | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set 1 Winner | 0% | — | — | — · <1¢ | $3.32K | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Match O/U 22.5 | 0% | — | — | — · <1¢ | $2.09K | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Match O/U 21.5 | 0% | — | — | — · <1¢ | $1.4K | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set Handicap +/-1.5 | 100% | — | — | 99¢ · 100¢ (1¢) | $474 | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set 2 Winner | 0% | — | — | — · <1¢ | $442 | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Total Sets: O/U 2.5 | 0% | — | — | — · <1¢ | $348 | in 7d |
| Completed Match | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | $105 | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Game Spread +/-2.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | $30 | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set Handicap +/-1.5 | 0% | — | — | — · 1¢ | $1.27 | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set 1 O/U 8.5 | 0% | — | — | — · <1¢ | — | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set 1 O/U 9.5 | 0% | — | — | — · <1¢ | — | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set 1 O/U 10.5 | 0% | — | — | — · <1¢ | — | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set 2 O/U 8.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set 2 O/U 9.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Set 2 O/U 10.5 | 0% | — | — | — · <1¢ | — | in 7d |
| Japan Women's Open: Katie Boulter vs Katerina Siniakova Match O/U 23.5 | 0% | — | — | — · <1¢ | — | in 7d |
| When | Trader | Outcome | Bet | Size | P&L now | Insider |
|---|---|---|---|---|---|---|
| 4h |  RN12 fills | Japan Women's Open: Katie Boulter vs Katerina Siniakova | BuyKaterina Siniakova91¢ → 100¢ | $29,467 | +$3,041 +10% | 10 |
| 4h |  tradecraft | Japan Women's Open: Katie Boulter vs Katerina Siniakova | BuyKaterina Siniakova86¢ → 100¢ | $3,454 | +$546 +16% | 6 |
| 4h | 0x1111111111 | Japan Women's Open: Katie Boulter vs Katerina Siniakova | BuyKaterina Siniakova89¢ → 100¢ | $2,941 | +$347 +12% | 5 |
| 5h |  oya64 | Japan Women's Open: Katie Boulter vs Katerina Siniakova | SellKaterina Siniakova70¢ → 100¢ | $1,041 | −$446 −43% | — |
| 5h | ferdinand2 | Japan Women's Open: Katie Boulter vs Katerina Siniakova | BuyKaterina Siniakova81¢ → 100¢ | $1,525 | +$358 +23% | 6 |
| 5h | UpTheBlues | Japan Women's Open: Katie Boulter vs Katerina Siniakova | BuyKaterina Siniakova81¢ → 100¢ | $3,050 | +$715 +23% | 6 |
| 9h | ferrariChampions2026 | Japan Women's Open: Katie Boulter vs Katerina Siniakova | BuyKatie Boulter39¢ → 0¢ | $2,329 | −$2,329 −100% | 5 |
| 16h | ferrariChampions2026 | Japan Women's Open: Katie Boulter vs Katerina Siniakova | BuyKaterina Siniakova61¢ → 100¢ | $8,117 | +$5,190 +64% | 9 |
| 21h | Dual-Criticism | Japan Women's Open: Katie Boulter vs Katerina Siniakova | BuyKaterina Siniakova60¢ → 100¢ | $1,980 | +$1,320 +67% | 5 |
This market refers to the tennis match between Katie Boulter and Katerina Siniakova in the Japan Women's Open, originally scheduled for October 24, 2026 at 12:30AM ET. This market will resolve to 'Katie Boulter' if Katie Boulter advances against Katerina Siniakova. This market will resolve to 'Katerina Siniakova' if Katerina Siniakova advances against Katie Boulter. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by November 7, 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: 0¢ for Japan Women's Open: Katie Boulter vs Katerina Siniakova means the market gives it about 0%.