Osaka vs. Rybakina: Set 1 Games O/U 8.5

Q: Osaka vs. Rybakina: Set 1 Games O/U 8.5

Prediction markets currently price this at 80%. A YES share costs 80.0¢ and pays $1 if it happens. That is a return of 25.0% over 8d.

National Bank Open: Naomi Osaka vs Elena Rybakina$3k liquidity$0 volumecloses 8d

TennisSportsGames

Trade on Polymarket

BUY YES

Cost: 80.0¢
Implied chance: 80.0%
Return if right: 25.0%
Spread cost: 21%

If you put in $100

You get 125.0 shares at 80.0¢ each.

YES wins: $125.00 back, a profit of $25.00. YES loses: $0.00, and the whole $100 is gone.

The gap between buyers and sellers takes $6.58 of that profit. Without it you would make $31.58.

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: 28.0¢
Implied chance: 28.0%
Return if right: 257.1%
Spread cost: 19%

If you put in $100

You get 357.1 shares at 28.0¢ each.

NO wins: $357.14 back, a profit of $257.14. NO loses: $0.00, and the whole $100 is gone.

The gap between buyers and sellers takes $59.52 of that profit. Without it you would make $316.67.

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: Aug 10, 08:56 PM4 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 “Osaka vs. Rybakina: Set 1 Games O/U 8.5”. 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 Naomi Osaka and Elena Rybakina in the National Bank Open, originally scheduled for August 11, 2026 at 10:00AM ET. This market will resolve to "Over" if the total number of games completed in the first set equals or exceeds 9. Otherwise, it will resolve to "Under." Any first-set tiebreak counts as one (1) game toward the total. If the first set is not completed for any reason, this market will resolve 50-50. If the match is canceled before play begins, or delayed beyond 7 days without commencement, this market will also resolve 50-50. Resolution will be based on official WTA results.

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