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| Outcome | Chance | 24h | 1 week | Bid · Ask | 24h volume | Ends |
|---|---|---|---|---|---|---|
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana | 0% | — | — | — · <1¢ | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set 2 Winner | 0% | — | — | — · <1¢ | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set 1 Winner | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set Handicap +/-1.5 | 0% | — | — | — · 20¢ | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Match O/U 21.5 | 100% | — | — | 99¢ · 100¢ (1¢) | — | ended |
| Completed Match | 100% | — | — | 100¢ · 100¢ (1¢) | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set 1 O/U 8.5 | 100% | — | — | 99¢ · 100¢ (1¢) | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set 2 O/U 8.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Total Sets: O/U 2.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set Handicap +/-1.5 | 0% | — | — | — · 1¢ | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set 2 O/U 9.5 | 0% | — | — | — · <1¢ | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set 1 O/U 9.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Match O/U 22.5 | 100% | — | — | 99¢ · 100¢ (1¢) | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set 2 O/U 10.5 | 0% | — | — | — · <1¢ | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Set 1 O/U 10.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Match O/U 23.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| US Open, Qualification WTA: Katie Swan vs Mary Stoiana Game Spread +/-3.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| When | Trader | Outcome | Bet | Size | P&L now | Insider |
|---|---|---|---|---|---|---|
| 58d | alexdave888 | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | SellMary Stoiana>99¢ | $14,985 | −$15 −0.1% | — |
| 58d | vladiva | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | SellMary Stoiana>99¢ | $2,825 | −$3 −0.1% | — |
| 58d | kapper-betka | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | SellMary Stoiana>99¢ | $6,294 | −$6 −0.1% | — |
| 58d | Shayanito | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | SellMary Stoiana46¢ → 100¢ | $1,324 | −$1,555 −117% | — |
| 58d | HomeRunHazard | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | BuyKatie Swan51¢ → 0¢ | $1,107 | −$1,107 −100% | 6 |
| 58d | omnibus-076daa | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | BuyKatie Swan51¢ → 0¢ | $2,382 | −$2,382 −100% | 6 |
| 58d | Flaznorp | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | BuyKatie Swan51¢ → 0¢ | $3,209 | −$3,209 −100% | 6 |
| 58d | elenaarybakin21 | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | BuyMary Stoiana79¢ → 100¢ | $3,286 | +$874 +27% | 5 |
| 58d |  RN1 | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | BuyMary Stoiana58¢ → 100¢ | $1,282 | +$928 +72% | 6 |
| 58d | ferrariChampions2026 | US Open, Qualification WTA: Katie Swan vs Mary Stoiana | BuyKatie Swan51¢ → 0¢ | $2,726 | −$2,726 −100% | 6 |
This market refers to the tennis match between Katie Swan and Mary Stoiana in the US Open, Qualification WTA, originally scheduled for August 26, 2026 at 3:30PM ET. This market will resolve to 'Katie Swan' if Katie Swan advances against Mary Stoiana. This market will resolve to 'Mary Stoiana' if Mary Stoiana advances against Katie Swan. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 9, 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 US Open, Qualification WTA: Katie Swan vs Mary Stoiana means the market gives it about 0%.