2026 Women’s US Open Winner (Tennis)

Platform comparison

Active sub-markets

Market context

The U.S. Open Women's Singles tournament will take place at Flushing Meadows from 23 August to 13 September 2026. The current 28% implied probability reflects moderate confidence in a specific player's victory, suggesting the market perceives a competitive field without a dominant favourite. The tournament's hard court surface and late-summer conditions in New York have historically favoured players with strong baseline power and stamina, though upsets remain common in Grand Slam events.

Historical precedent shows that women's Grand Slam winners over the past decade have come from a broad pool of competitors, with no single player capturing more than two titles in any calendar year since 2016. The 2025 and early 2026 rankings, injury patterns, and form leading into August will substantially influence which contenders enter as seeded players. Previous U.S. Open women's champions have ranged from consistent top-10 fixtures to unseeded challengers, indicating that a 28% probability for any individual player reflects realistic competitive depth rather than exceptional concentration.

Traders should monitor player announcements regarding injury recovery and tournament commitments through summer 2026, as late withdrawals have historically shifted odds significantly. The WTA tour schedule in the months preceding the Open—particularly results at Cincinnati and other hard-court events—will serve as the primary catalyst for probability shifts. Tournament draw announcements typically occur one week before play begins, after which seeding and matchup structure become fixed factors influencing knockout progression.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Tax UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Polymarket Tax UK?

Zero. Polymarket Tax UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.