Cincinnati Open: Coco Gauff vs Ann Li

Platform comparison

Market context

Coco Gauff and Ann Li are scheduled to meet in the Cincinnati Open on 18 August 2026, with the match originally set for 10:00 AM ET. The current crowd-implied probability stands at 100% YES for Gauff, suggesting near-certainty of the match occurring and resolving to a winner rather than cancellation, retirement, or extended delay. This extreme confidence reflects both the tournament's established infrastructure and the absence of reported scheduling conflicts as of the settlement window's opening.

Gauff's ranking and seeding typically position her as favourite in such matchups, though sportsbook lines on the match outcome itself often diverge from prediction-market probabilities on whether the contest takes place. Historical precedent from ATP and WTA events shows that matches scheduled at major tournaments like Cincinnati rarely fail to produce a decisive result; cancellations and retirements occur in roughly 2–4% of main-draw contests. The 100% probability here reflects confidence in match completion rather than prediction of Gauff's victory specifically.

Traders should monitor tournament draw confirmations and player injury reports through early August. Recent WTA scheduling announcements typically arrive 10–14 days before tournament commencement. Weather disruptions at the Cincinnati venue have occasionally caused single-day delays but rarely push matches beyond the seven-day threshold that would trigger a 50-50 resolution. Any withdrawal by either player or official postponement beyond 25 August would immediately reframe the contract's value.

Methodology

We track Cincinnati Open: Coco Gauff vs Ann Li across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Best Prediction Markets. 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.

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.