Set 1 Winner: Kostyuk vs Stephens
BUY YES
- Cost
- 81.0¢
- Implied chance
- 81.0%
- Return if right
- 23.5%
- Spread cost
- 21%
If you put in $100
You get 123.5 shares at 81.0¢ each.
YES wins: $123.46 back, a profit of $23.46. YES loses: $0.00, and the whole $100 is gone.
The gap between buyers and sellers takes $6.41 of that profit. Without it you would make $29.87.
Assumes the whole order fills at this price. A large order eats into the book and averages worse.
Buy YES on Polymarket
BUY NO
- Cost
- 27.0¢
- Implied chance
- 27.0%
- Return if right
- 270.4%
- Spread cost
- 19%
If you put in $100
You get 370.4 shares at 27.0¢ each.
NO wins: $370.37 back, a profit of $270.37. NO loses: $0.00, and the whole $100 is gone.
The gap between buyers and sellers takes $64.41 of that profit. Without it you would make $334.78.
Assumes the whole order fills at this price. A large order eats into the book and averages worse.
Buy NO on Polymarket
- US Open WTA: Marta Kostyuk vs Sloane Stephens Set 1 Winner78.5%
- US Open WTA: Marta Kostyuk vs Sl…84.5%
- US Open WTA: Marta Kostyuk vs Sloane Stephens Total Sets: O/U 2.550.0%
- US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 O/U 9.549.5%
- US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 O/U 10.549.5%
- US Open WTA: Marta Kostyuk vs Sloane Stephens Set 2 O/U 8.549.5%
Latest: Sep 1, 07:24 AM4 further outcomes not shown
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Headlines are matched on the names in “Set 1 Winner: Kostyuk vs Stephens”. Nobody checks them by hand, so one may not be relevant. They also say nothing about whether the price has already moved on this news.
How this market resolves
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 “Kostyuk” if Marta Kostyuk wins the first set. It will resolve to “Stephens” if Sloane Stephens wins the first set. If the match begins but is not completed, and the first set is concluded with a winner determined, this market will resolve based on that completed set. If the first set is not completed for any reason, this market will resolve 50-50. If the match is canceled (not played at all) or play has not begun by September 16, 2026, 11:59 PM ET (14 days after the scheduled start), this market will resolve 50-50. Resolution will be based on official Grand Slam match statistics.
Source: https://www.wtatennis.com/scores
Other outcomes in US Open WTA: Marta Kostyuk vs Sloane Stephens
- US Open WTA: Marta Kostyuk vs Sloane Stephens
- Set 2 Winner: Kostyuk vs Stephens
- Marta Kostyuk vs. Sloane Stephens: Total Sets O/U 2.5
- Kostyuk vs. Stephens: Set 2 Games O/U 9.5
- Kostyuk vs. Stephens: Set 2 Games O/U 10.5
- Kostyuk vs. Stephens: Set 2 Games O/U 8.5
- Kostyuk vs. Stephens: Set 1 Games O/U 9.5
- Kostyuk vs. Stephens: Set 1 Games O/U 8.5
- Kostyuk vs. Stephens: Set 1 Games O/U 10.5
- Set Handicap: Kostyuk (-1.5) vs Stephens (+1.5)
- Kostyuk vs. Stephens: Match O/U 23.5
- Kostyuk vs. Stephens: Match O/U 21.5
- Kostyuk vs. Stephens: Match O/U 22.5
- Game Spread: Kostyuk (-5.5) vs Stephens (+5.5)
- US Open WTA: Completed Match: Marta Kostyuk vs Sloane Stephens