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| Outcome | Chance | 24h | 1 week | Bid · Ask | 24h volume | Ends |
|---|---|---|---|---|---|---|
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | 100% | +26 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set Handicap +/-1.5 | 100% | +51 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set 2 Winner | 100% | +32 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Game Spread +/-4.5 | 100% | +54 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set 1 Winner | 100% | +33 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| Completed Match | 100% | +50 pts | — | 99¢ · 100¢ (1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Match O/U 21.5 | 0% | −47 pts | — | — · 1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Total Sets: O/U 2.5 | 0% | −35 pts | — | — · 1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set 1 O/U 10.5 | 0% | −24 pts | — | — · <1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Match O/U 22.5 | 0% | −43 pts | — | — · 1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set 1 O/U 8.5 | 100% | +62 pts | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set 2 O/U 8.5 | 0% | −50 pts | — | — · 1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set 2 O/U 9.5 | 0% | −50 pts | — | — · 1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set 1 O/U 9.5 | 0% | −46 pts | — | — · 1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Match O/U 23.5 | 0% | −41 pts | — | — · 1¢ | — | ended |
| US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set 2 O/U 10.5 | 0% | −50 pts | — | — · 1¢ | — | ended |
| When | Trader | Outcome | Bet | Size | P&L now | Insider |
|---|---|---|---|---|---|---|
| 49d | kkookkoo | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova Set Handicap +/-1.5 | SellKostyuk>99¢ | $17,882 | −$18 −0.1% | — |
| 49d | eugenepol0 | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | SellMarta Kostyuk>99¢ | $2,149 | −$2 −0.1% | — |
| 49d |  MathPsycho | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | SellMarta Kostyuk>99¢ | $2,023 | −$2 −0.1% | — |
| 49d |  hd777 | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk>99¢ | $20,743 | +$21 +0.1% | 4 |
| 49d | Hoch | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk91¢ → 100¢ | $2,000 | +$198 +9.9% | 5 |
| 49d | eugenepol0 | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk93¢ → 100¢ | $2,000 | +$152 +7.6% | 4 |
| 49d | MathPsycho | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk90¢ → 100¢ | $1,822 | +$202 +11% | 5 |
| 49d | HomeRunHazard | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk91¢ → 100¢ | $7,292 | +$721 +9.9% | 5 |
| 49d | w1n3r | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk89¢ → 100¢ | $6,977 | +$862 +12% | 5 |
| 49d | Mad-Wound | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk92¢ → 100¢ | $2,200 | +$192 +8.7% | 5 |
| 49d | justnotchu | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk89¢ → 100¢ | $1,470 | +$182 +12% | 5 |
| 49d | johnnnnnnn | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk87¢ → 100¢ | $1,740 | +$260 +15% | 5 |
| 49d |  hobo69 | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk87¢ → 100¢ | $1,305 | +$195 +15% | 5 |
| 49d | flatbarrel | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | SellEkaterina Alexandrova14¢ → 0¢ | $1,016 | +$1,016 +100% | — |
| 49d |  ZaiZoiBele | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk83¢ → 100¢ | $1,422 | +$291 +20% | 5 |
| 49d | Rash-Copying3 fills | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyEkaterina Alexandrova18¢ → 0¢ | $9,400 | −$9,400 −100% | 6 |
| 49d | flatbarrel | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyEkaterina Alexandrova16¢ → 0¢ | $1,533 | −$1,533 −100% | 6 |
| 49d | 0b12 fills | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk82¢ → 100¢ | $16,061 | +$3,529 +22% | 5 |
| 49d | Substantial-Service | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyEkaterina Alexandrova26¢ → 0¢ | $1,358 | −$1,358 −100% | 6 |
| 49d | ferrariChampions2026 | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyEkaterina Alexandrova23¢ → 0¢ | $2,475 | −$2,475 −100% | 6 |
| 49d | thanhtam86 | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk76¢ → 100¢ | $1,520 | +$480 +32% | 6 |
| 49d | ferrariChampions20263 fills | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk75¢ → 100¢ | $20,411 | +$6,753 +33% | 4 |
| 49d | riitmo | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk75¢ → 100¢ | $1,581 | +$523 +33% | 4 |
| 49d | bgpowerx11 | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk75¢ → 100¢ | $1,005 | +$335 +33% | 4 |
| 49d | neutralwave23 | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyEkaterina Alexandrova26¢ → 0¢ | $1,930 | −$1,930 −100% | 4 |
| 49d | deepakrego | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyMarta Kostyuk75¢ → 100¢ | $3,450 | +$1,150 +33% | 4 |
| 49d | AV23IUa | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyEkaterina Alexandrova25¢ → 0¢ | $2,065 | −$2,065 −100% | 4 |
| 50d | Brimoz2 fills | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | SellEkaterina Alexandrova24¢ → 0¢ | $5,367 | +$5,367 +100% | — |
| 50d | Brimoz3 fills | US Open WTA: Marta Kostyuk vs Ekaterina Alexandrova | BuyEkaterina Alexandrova27¢ → 0¢ | $9,050 | −$9,050 −100% | 4 |
This market refers to the tennis match between Marta Kostyuk and Ekaterina Alexandrova in the US Open WTA, originally scheduled for September 4, 2026 at 11:00AM ET. This market will resolve to 'Marta Kostyuk' if Marta Kostyuk advances against Ekaterina Alexandrova. This market will resolve to 'Ekaterina Alexandrova' if Ekaterina Alexandrova 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 18, 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 Ekaterina Alexandrova means the market gives it about 100%.