2026 Women’s US Open Winner (Tennis)

Platform comparison

Market context

Polymarket is pricing **Aryna Sabalenka** at **25%** to win the 2026 U.S. Open women’s singles, with **Iga Świątek** the nearest rival at **10%**.[1] On the market’s own mechanics, traders are swapping USDC-settled positions on Polygon via conditional tokens, so the price is a live consensus on who will lift the trophy rather than a forecast of who is simply strongest on paper.[1]

That 25% sits in the range of recent market and sportsbook signals, but it is still a narrow favourite’s price for a Grand Slam field that typically turns on draw quality, fitness and surface form in the final fortnight.[1][4][6] Comparable futures boards have kept Sabalenka near the top, with one July 2026 betting board listing her around +200 and another market tracker putting her near 23% a few days earlier, which suggests the contract has been valuing her as the most likely single winner without implying anything close to certainty.[4][5]

For traders, the main catalysts are the August seedings, the draw, and any late injury or withdrawal news that changes who is still eligible to win before the event closes on 13 September 2026.[1] The market can also move sharply on scheduling and fitness updates from the hard-court swing, because a pre-tournament issue can reprice both the outright favourite and the field behind her; Polymarket’s settlement rules mean any player ruled out under tournament rules would be priced to **No**, while an outright cancellation or no winner by the deadline would push resolution to **Other**.[1]

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 Scam?, 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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Scam? 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.