Set Handicap: Kostyuk (-1.5) vs Stephens (+1.5)

Q: Set Handicap: Kostyuk (-1.5) vs Stephens (+1.5)

Prediction markets currently price this at 98%. A YES share costs 98.0¢ and pays $1 if it happens. That is a return of 2.0% over 8d.

US Open WTA: Marta Kostyuk vs Sloane Stephens$4 liquidity$0 volumecloses 8d

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Trade on Polymarket

BUY YES

Cost: 98.0¢
Implied chance: 98.0%
Return if right: 2.0%
Spread cost: 98%

If you put in $100

You get 102.0 shares at 98.0¢ each.

YES wins: $102.04 back, a profit of $2.04. YES loses: $0.00, and the whole $100 is gone.

The gap between buyers and sellers takes $97.96 of that profit. Without it you would make $100.00.

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: 98.0¢
Implied chance: 98.0%
Return if right: 2.0%
Spread cost: 98%

If you put in $100

You get 102.0 shares at 98.0¢ each.

NO wins: $102.04 back, a profit of $2.04. NO loses: $0.00, and the whole $100 is gone.

The gap between buyers and sellers takes $97.96 of that profit. Without it you would make $100.00.

Assumes the whole order fills at this price. A large order eats into the book and averages worse.

Buy NO on Polymarket

Chance over time

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Latest: Sep 1, 07:27 AM4 further outcomes not shown

Latest news

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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 by 2 or more sets than Sloane Stephens, based on the final completed score. Otherwise, it will resolve to "Stephens." If the match begins but is not completed due to retirement, default, or disqualification, this market will resolve 50-50, unless the outcome of this market has already been unconditionally determined by the completed portion of play. For example, if the deciding set has begun when the match ends, Marta Kostyuk can no longer win by 2 or more sets, and this market will resolve to "Stephens." If the match is canceled before play begins, or a result has not been determined 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 results.

Source: https://www.wtatennis.com/scores