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| Outcome | Chance | 24h | 1 week | Bid · Ask | 24h volume | Ends |
|---|---|---|---|---|---|---|
| Porto: Erika Andreeva vs Katie Swan | 50% | +1 pts | — | 50¢ · 51¢ (1¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Set 1 O/U 10.5 | 50% | — | — | 49¢ · 50¢ (1¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Set Handicap +/-1.5 | 50% | +1 pts | — | 50¢ · 51¢ (1¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Match O/U 23.5 | 50% | +1 pts | — | 50¢ · 51¢ (1¢) | — | ended |
| Completed Match | 0% | −1 pts | — | — · <1¢ | — | ended |
| Porto: Erika Andreeva vs Katie Swan Set 1 O/U 9.5 | 50% | — | — | 50¢ · 51¢ (1¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Match O/U 22.5 | 50% | — | — | 49¢ · 50¢ (1¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Game Spread +/-3.5 | 50% | −1 pts | — | — · 100¢ | — | ended |
| Porto: Erika Andreeva vs Katie Swan Match O/U 21.5 | 50% | −25 pts | — | — · 51¢ | — | ended |
| Porto: Erika Andreeva vs Katie Swan Set 1 Winner | 50% | −1 pts | — | 49¢ · 51¢ (2¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Set 2 Winner | 50% | −1 pts | — | 49¢ · 51¢ (2¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Total Sets: O/U 2.5 | 50% | −1 pts | — | 49¢ · 51¢ (2¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Set 1 O/U 8.5 | 50% | −1 pts | — | 49¢ · 51¢ (2¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Set 2 O/U 8.5 | 50% | −1 pts | — | 49¢ · 51¢ (2¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Set 2 O/U 9.5 | 50% | −1 pts | — | 49¢ · 51¢ (2¢) | — | ended |
| Porto: Erika Andreeva vs Katie Swan Set 2 O/U 10.5 | 50% | −1 pts | — | 49¢ · 51¢ (2¢) | — | ended |
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This market refers to the tennis match between Erika Andreeva and Katie Swan in the Porto, originally scheduled for September 21, 2026 at 6:00AM ET. This market will resolve to 'Erika Andreeva' if Erika Andreeva advances against Katie Swan. This market will resolve to 'Katie Swan' if Katie Swan advances against Erika Andreeva. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 5, 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: 50¢ for Porto: Erika Andreeva vs Katie Swan means the market gives it about 50%.