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| Outcome | Chance | 24h | 1 week | Bid · Ask | 24h volume | Ends |
|---|---|---|---|---|---|---|
| US Open WTA: Marta Kostyuk vs Sloane Stephens | 100% | +12 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Set Handicap +/-1.5 | 100% | +32 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Set 1 Winner | 100% | +19 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 Winner | 100% | +18 pts | — | 99¢ · 100¢ (1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Set 1 O/U 8.5 | 0% | −57 pts | — | — · <1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Game Spread +/-5.5 | 100% | +45 pts | — | 99¢ · 100¢ (1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Total Sets: O/U 2.5 | 0% | −26 pts | — | — · <1¢ | — | ended |
| Completed Match | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Match O/U 21.5 | 0% | −39 pts | — | — · <1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 O/U 8.5 | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Match O/U 22.5 | 0% | −25 pts | — | — · <1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Set 1 O/U 9.5 | 0% | −49 pts | — | — · <1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 O/U 9.5 | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Set 1 O/U 10.5 | 0% | −32 pts | — | — · <1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Match O/U 23.5 | 0% | −25 pts | — | — · <1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 O/U 10.5 | 100% | +50 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| When | Trader | Outcome | Bet | Size | P&L now | Insider |
|---|---|---|---|---|---|---|
| 51d | johnnnnnnn | US Open WTA: Marta Kostyuk vs Sloane Stephens | SellMarta Kostyuk>99¢ | $1,998 | −$2 −0.1% | — |
| 51d | greyner | US Open WTA: Marta Kostyuk vs Sloane Stephens | SellMarta Kostyuk>99¢ | $1,301 | −$1 −0.1% | — |
| 51d | AnonymousPerson | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk>99¢ | $3,183 | +$3 +0.1% | 4 |
| 51d | cremebrule | US Open WTA: Marta Kostyuk vs Sloane Stephens | SellMarta Kostyuk98¢ → 100¢ | $1,073 | −$20 −1.8% | — |
| 51d | tennistrader20 | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuySloane Stephens16¢ → 0¢ | $4,000 | −$4,000 −100% | 6 |
| 51d | omnibus-076daa | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuySloane Stephens10¢ → 0¢ | $2,020 | −$2,020 −100% | 6 |
| 51d | Flaznorp | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuySloane Stephens10¢ → 0¢ | $1,145 | −$1,145 −100% | 6 |
| 51d | flatbarrel | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuySloane Stephens10¢ → 0¢ | $1,164 | −$1,164 −100% | 6 |
| 51d |  tradecraft | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuySloane Stephens10¢ → 0¢ | $1,164 | −$1,164 −100% | 6 |
| 51d | 0b1 | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk90¢ → 100¢ | $4,508 | +$506 +11% | 5 |
| 51d | HomeRunHazard3 fills | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk96¢ → 100¢ | $9,222 | +$392 +4.3% | 4 |
| 51d | johnnnnnnn | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk94¢ → 100¢ | $1,880 | +$120 +6.4% | 4 |
| 51d | Flaznorp | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk92¢ → 100¢ | $1,612 | +$140 +8.7% | 5 |
| 51d | ferrariChampions2026 | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuySloane Stephens12¢ → 0¢ | $1,336 | −$1,336 −100% | 6 |
| 51d | ripley86alien5 fills | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk89¢ → 100¢ | $32,451 | +$4,176 +13% | 5 |
| 51d |  RegardedMoney | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk89¢ → 100¢ | $1,751 | +$216 +12% | 5 |
| 51d | madridcurious44 | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuyMarta Kostyuk89¢ → 100¢ | $1,335 | +$165 +12% | 5 |
| 51d | Kkunn | US Open WTA: Marta Kostyuk vs Sloane Stephens Set Handicap +/-1.5 | BuyStephens36¢ → 0¢ | $1,100 | −$1,100 −100% | 6 |
| 52d | Wordy-Littleneck | US Open WTA: Marta Kostyuk vs Sloane Stephens | BuySloane Stephens13¢ → 0¢ | $1,500 | −$1,500 −100% | 4 |
This market refers to the tennis match between Marta Kostyuk and Sloane Stephens in the US Open WTA, originally scheduled for September 2, 2026 at 11:00AM 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 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: Marta Kostyuk vs Sloane Stephens means the market gives it about 100%.