Set 1 Winner: Tatiana Prozorova vs Sofia Costoulas

Q: Set 1 Winner: Tatiana Prozorova vs Sofia Costoulas

Prediction markets currently price this at 73%. A YES share costs 73.0¢ and pays $1 if it happens. That is a return of 37.0% over 4d.

Singapore Open: Tatiana Prozorova vs Sofia Costoulas$1k liquidity$33 volumecloses 4d

TennisSportsGames

Trade on Polymarket

BUY YES

Cost: 73.0¢
Implied chance: 73.0%
Return if right: 37.0%
Spread cost: 14%

If you put in $100

You get 137.0 shares at 73.0¢ each.

YES wins: $136.99 back, a profit of $36.99. YES loses: $0.00, and the whole $100 is gone.

The gap between buyers and sellers takes $5.87 of that profit. Without it you would make $42.86.

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: 33.0¢
Implied chance: 33.0%
Return if right: 203.0%
Spread cost: 13%

If you put in $100

You get 303.0 shares at 33.0¢ each.

NO wins: $303.03 back, a profit of $203.03. NO loses: $0.00, and the whole $100 is gone.

The gap between buyers and sellers takes $30.30 of that profit. Without it you would make $233.33.

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

1H 6H 1D 1W 1M ALL

Latest: Sep 22, 09:00 AM4 further outcomes not shown

Latest news

headlines link to their publishers

No recent headlines matched this market. We only show an article when the names in the question appear in its headline, so a very local or very new market often has nothing. Showing nothing is deliberate: an unrelated story here would read like evidence about the price.

Headlines are matched on the names in “Set 1 Winner: Tatiana Prozorova vs Sofia Costoulas”. 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 Tatiana Prozorova and Sofia Costoulas in the Singapore Open, originally scheduled for September 20, 2026 at 10:00PM ET. This market will resolve to “Tatiana Prozorova” if Tatiana Prozorova wins the first set. It will resolve to “Sofia Costoulas” if Sofia Costoulas 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 October 4, 2026, 11:59 PM ET (14 days after the scheduled start), this market will resolve 50-50. Resolution will be based on official WTA match statistics.

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