Set 1 Winner: Costoulas vs Ruggeri

Q: Set 1 Winner: Costoulas vs Ruggeri

Prediction markets currently price this at 97%. A YES share costs 97.0¢ and pays $1 if it happens. That is a return of 3.1% over 8d.

US Open, Qualification WTA: Sofia Costoulas vs Jennifer Ruggeri$69 liquidity$0 volumecloses 8d

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Trade on Polymarket

BUY YES

Cost: 97.0¢
Implied chance: 97.0%
Return if right: 3.1%
Spread cost: 97%

If you put in $100

You get 103.1 shares at 97.0¢ each.

YES wins: $103.09 back, a profit of $3.09. YES loses: $0.00, and the whole $100 is gone.

The gap between buyers and sellers takes $98.93 of that profit. Without it you would make $102.02.

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 $95.98 of that profit. Without it you would make $98.02.

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: Aug 24, 04:50 AM4 further outcomes not shown

Latest news

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Headlines are matched on the names in “Set 1 Winner: Costoulas vs Ruggeri”. 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 Sofia Costoulas and Jennifer Ruggeri in the US Open, Qualification WTA, originally scheduled for August 25, 2026 at 11:00AM ET. This market will resolve to “Costoulas” if Sofia Costoulas wins the first set. It will resolve to “Ruggeri” if Jennifer Ruggeri 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 8, 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