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| Outcome | Chance | 24h | 1 week | Bid · Ask | 24h volume | Ends |
|---|---|---|---|---|---|---|
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens | 100% | +13 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 1 Winner | 100% | +21 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set Handicap +/-1.5 | 100% | +34 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 2 Winner | 100% | +19 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Total Sets: O/U 2.5 | 0% | −27 pts | — | — · <1¢ | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Match O/U 21.5 | 100% | +61 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 1 O/U 8.5 | 100% | +41 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Match O/U 22.5 | 100% | +62 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 2 O/U 8.5 | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Completed Match | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 1 O/U 9.5 | 100% | +64 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 2 O/U 9.5 | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 1 O/U 10.5 | 100% | +82 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Set 2 O/U 10.5 | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Cincinnati Open: Marta Kostyuk vs Sloane Stephens Match O/U 23.5 | 100% | +63 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| When | Trader | Outcome | Bet | Size | P&L now | Insider |
|---|---|---|---|---|---|---|
| 66d | eugenepol0 | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | SellMarta Kostyuk>99¢ | $3,143 | −$3 −0.1% | — |
| 66d | phredmoz | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | SellMarta Kostyuk>99¢ | $1,912 | −$2 −0.1% | — |
| 66d | HomeRunHazard5 fills | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk89¢ → 100¢ | $12,067 | +$1,453 +12% | 5 |
| 66d |  ZaiZoiBele | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk86¢ → 100¢ | $1,008 | +$164 +16% | 5 |
| 66d | blessedna | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk80¢ → 100¢ | $1,000 | +$250 +25% | 5 |
| 66d | Arcus-AI | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | SellMarta Kostyuk83¢ → 100¢ | $1,038 | −$212 −20% | — |
| 66d | acorp | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk92¢ → 100¢ | $12,880 | +$1,120 +8.7% | 5 |
| 66d | HomeRunHazard | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuySloane Stephens16¢ → 0¢ | $1,064 | −$1,064 −100% | 6 |
| 66d | eugenepol0 | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk89¢ → 100¢ | $2,800 | +$346 +12% | 5 |
| 66d | phredmoz | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk86¢ → 100¢ | $1,637 | +$266 +16% | 5 |
| 66d | ferrariChampions2026 | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuySloane Stephens18¢ → 0¢ | $1,637 | −$1,637 −100% | 6 |
| 66d | 0b1 | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk88¢ → 100¢ | $26,399 | +$3,600 +14% | 5 |
| 66d | comon119 | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk87¢ → 100¢ | $4,350 | +$650 +15% | 5 |
| 66d | Hoch | Cincinnati Open: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk87¢ → 100¢ | $2,000 | +$299 +15% | 5 |
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 'Marta Kostyuk' if Marta Kostyuk advances against Sloane Stephens. This market will resolve to 'Sloane Stephens' if Sloane Stephens advances against Marta Kostyuk. 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: 100¢ for Cincinnati Open: Marta Kostyuk vs Sloane Stephens means the market gives it about 100%.