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| Outcome | Chance | 24h | 1 week | Bid · Ask | 24h volume | Ends |
|---|---|---|---|---|---|---|
| National Bank Open: Marta Kostyuk vs Katherine Sebov | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set 1 Winner | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Match O/U 21.5 | 0% | — | — | — · <1¢ | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set Handicap +/-1.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Match O/U 22.5 | 0% | — | — | — · <1¢ | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Match O/U 23.5 | 0% | — | — | — · <1¢ | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Total Sets: O/U 2.5 | 0% | — | — | — · <1¢ | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set 1 O/U 8.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| Completed Match | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set 2 Winner | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set 2 O/U 8.5 | 0% | — | — | — · <1¢ | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set 1 O/U 9.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set Handicap +/-1.5 | 0% | — | — | — · <1¢ | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set 2 O/U 9.5 | 0% | — | — | — · <1¢ | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set 1 O/U 10.5 | 100% | — | — | >99¢ · 100¢ (<1¢) | — | ended |
| National Bank Open: Marta Kostyuk vs Katherine Sebov Set 2 O/U 10.5 | 0% | — | — | — · <1¢ | — | ended |
| When | Trader | Outcome | Bet | Size | P&L now | Insider |
|---|---|---|---|---|---|---|
| 81d | yupiiiiiiiii | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyMarta Kostyuk>99¢ | $1,203 | +$1 +0.1% | 4 |
| 81d | 12f842n2e76 | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyMarta Kostyuk97¢ → 100¢ | $1,080 | +$32 +3.0% | 4 |
| 81d | Aleks100 | National Bank Open: Marta Kostyuk vs Katherine Sebov | SellMarta Kostyuk94¢ → 100¢ | $1,127 | −$73 −6.5% | — |
| 81d | 8a7sh2 | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyMarta Kostyuk91¢ → 100¢ | $10,000 | +$992 +9.9% | 5 |
| 81d | Aleks100 | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyMarta Kostyuk86¢ → 100¢ | $1,034 | +$166 +16% | 5 |
| 81d | eokho | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyKatherine Sebov20¢ → 0¢ | $1,731 | −$1,731 −100% | 6 |
| 81d | swisstony | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyKatherine Sebov15¢ → 0¢ | $1,979 | −$1,979 −100% | 6 |
| 81d |  tradecraft2 fills | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyMarta Kostyuk80¢ → 100¢ | $14,369 | +$3,631 +25% | 5 |
| 81d | flatbarrel | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyMarta Kostyuk77¢ → 100¢ | $1,958 | +$585 +30% | 6 |
| 81d |  one8tyfive | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyMarta Kostyuk77¢ → 100¢ | $1,376 | +$413 +30% | 6 |
| 81d | HomeRunHazard | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyMarta Kostyuk87¢ → 100¢ | $3,017 | +$439 +15% | 5 |
| 81d | swisstony | National Bank Open: Marta Kostyuk vs Katherine Sebov | BuyMarta Kostyuk95¢ → 100¢ | $1,900 | +$100 +5.3% | 4 |
This market refers to the tennis match between Marta Kostyuk and Katherine Sebov in the National Bank Open, originally scheduled for August 4, 2026 at 2:00PM ET. This market will resolve to 'Marta Kostyuk' if Marta Kostyuk advances against Katherine Sebov. This market will resolve to 'Katherine Sebov' if Katherine Sebov 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 National Bank Open: Marta Kostyuk vs Katherine Sebov means the market gives it about 100%.