Pronóstico: 2026 Women’s US Open Winner (Tennis)

Platform comparison

Market context

The 2026 U.S. Open Women’s Singles tournament, running from 23 August to 13 September in New York, is the real-world event this prediction market tracks. On Polymarket today, the contract for a listed player winning prices at 23% YES, implying a modest but tangible chance of success for the favoured contenders. This probability sits below Aryna Sabalenka’s +200 odds on Vegas Insider and BetUS, where she is installed as the favourite for a third consecutive year[1][2].

Historically, Grand Slam probabilities often diverge from bookmaker favourites when early-season form shifts or injuries emerge. In 2024, Iga Świątek’s +500 odds at the US Open did not reflect her eventual dominance, while Mirra Andreeva’s +1200 longshot status proved a value trap before her rise[1]. The current 23% market price suggests traders are weighing Sabalenka’s consistency against the volatility of the draw and the potential for a breakthrough by Gauff or Rybakina, whose +700 and +800 odds hint at comparable upside[1][9].

Traders should monitor the WTA’s official schedule releases for August, particularly any withdrawal announcements from top players ahead of the tournament. A recent FanDuel update confirms Sabalenka’s +210 lead, but conditional tokens on Polymarket will resolve to “No” if a listed player becomes ineligible under tournament rules[5]. Key catalysts include the US Open’s entry list publication and any injury updates from the US Tennis Association, which could alter the implied probability before the settlement window closes on 13 September 2026.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Argentina, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Argentina. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Argentina trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.