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| Outcome | Chance | 24h | 1 week | Bid · Ask | 24h volume | Ends |
|---|---|---|---|---|---|---|
| Cincinnati Open: Katerina Siniakova vs Madison Keys | 0% | −26 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Match O/U 21.5 | 0% | −46 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Set Handicap +/-1.5 | 100% | +48 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Set 1 Winner | 0% | −31 pts | — | — · <1¢ | — | ended |
| Completed Match | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Total Sets: O/U 2.5 | 0% | −35 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Set 1 O/U 8.5 | 0% | −66 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Set 1 O/U 9.5 | 0% | −45 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Set 2 Winner | 0% | −50 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Match O/U 23.5 | 0% | −38 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Set 2 O/U 8.5 | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Match O/U 22.5 | 0% | −41 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Set 2 O/U 9.5 | 0% | −50 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Set 2 O/U 10.5 | 0% | −50 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Katerina Siniakova vs Madison Keys Set 1 O/U 10.5 | 0% | −24 pts | — | — · <1¢ | — | ended |
| When | Trader | Outcome | Bet | Size | P&L now | Insider |
|---|---|---|---|---|---|---|
| 60d | PRppr | Cincinnati Open: Katerina Siniakova vs Madison Keys | SellMadison Keys>99¢ | $1,166 | −$1 −0.1% | — |
| 60d | thatsabing0 | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys>99¢ | $17,760 | +$18 +0.1% | 4 |
| 60d | saltibiscoti | Cincinnati Open: Katerina Siniakova vs Madison Keys | SellMadison Keys98¢ → 100¢ | $1,368 | −$28 −2.1% | — |
| 60d | swisstony2 fills | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys97¢ → 100¢ | $4,717 | +$143 +3.0% | 4 |
| 60d | HomeRunHazard2 fills | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys96¢ → 100¢ | $7,081 | +$261 +3.7% | 4 |
| 60d | leohe | Cincinnati Open: Katerina Siniakova vs Madison Keys | SellMadison Keys94¢ → 100¢ | $2,727 | −$183 −6.7% | — |
| 60d | AGUGava | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyKaterina Siniakova6¢ → 0¢ | $1,264 | −$1,264 −100% | 6 |
| 60d | 0b1 | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys97¢ → 100¢ | $11,937 | +$369 +3.1% | 4 |
| 60d |  hd777 | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys98¢ → 100¢ | $11,648 | +$190 +1.6% | 4 |
| 60d | Pandaboss | Cincinnati Open: Katerina Siniakova vs Madison Keys | SellMadison Keys98¢ → 100¢ | $1,683 | −$35 −2.1% | — |
| 60d | Pandaboss | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys96¢ → 100¢ | $1,650 | +$69 +4.2% | 4 |
| 60d |  fxwd12345 | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys95¢ → 100¢ | $2,000 | +$105 +5.3% | 4 |
| 60d | ssj3 | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys82¢ → 100¢ | $5,000 | +$1,098 +22% | 5 |
| 60d | swy01 | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys83¢ → 100¢ | $15,435 | +$3,161 +20% | 5 |
| 60d | leohe | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys78¢ → 100¢ | $2,270 | +$640 +28% | 5 |
| 60d | deepakrego | Cincinnati Open: Katerina Siniakova vs Madison Keys | BuyMadison Keys78¢ → 100¢ | $3,900 | +$1,100 +28% | 5 |
| 60d | neutralwave23 | Cincinnati Open: Katerina Siniakova vs Madison Keys Match O/U 21.5 | BuyOver49¢ → 0¢ | $1,388 | −$1,388 −100% | 4 |
eskk3,013 sharesThis market refers to the tennis match between Katerina Siniakova and Madison Keys in the Cincinnati Open, originally scheduled for August 18, 2026 at 10:00AM ET. This market will resolve to 'Katerina Siniakova' if Katerina Siniakova advances against Madison Keys. This market will resolve to 'Madison Keys' if Madison Keys advances against Katerina Siniakova. 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 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 Cincinnati Open: Katerina Siniakova vs Madison Keys means the market gives it about 0%.