US Open, Qualification ATP: Francesco Passaro vs Felix Gill

Platform comparison

Market context

Francesco Passaro and Felix Gill met in US Open qualifying, with the match listed as a Round 1 contest on hard courts at Flushing Meadows and both players drawn in the same section of the men’s qualifying bracket.[1][2] Bookmakers made Passaro a modest favourite, with typical outright match prices around 1.72-1.79 for Passaro and 2.00-2.08 for Gill, implying a narrow edge rather than a one-sided contest.[4][6][11] That sits awkwardly against the contract’s current 100% YES reading, which suggests the market is pricing the event as already decided or effectively certain rather than reflecting a live pre-match line.

The best historical frame is the absence of a meaningful head-to-head and the players’ closely matched rankings, with Passaro around ATP 222 and Gill around ATP 221 on the event listings.[2][3] Tennis preview desks were split, with one model-side preview leaning Gill in three sets while sportsbook consensus still shaded Passaro, a classic sign that the true match-up is competitive even when margins are small.[5][6] In that sort of setup, prediction-market prices usually move hardest on whether the match is confirmed as played, whether a result is entered cleanly, and whether any postponement pushes it towards settlement risk.

The main catalysts are tournament scheduling and official result updates from the US Open qualifying draw, which was set for 24-25 August in Fan Week, with qualifying using the same hard-court outer courts and frequent same-day rescheduling.[8][9] The event page and draw sheet show this was a standard qualifying fixture rather than a delayed main-draw match, so traders should watch for withdrawal notices, walkover language, and whether the scoreline is formally completed in the official draw.[8][10] If the match was not played at all or no winner is recorded by the settlement deadline, the contract’s fallback 50-50 outcome becomes the relevant risk.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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?

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

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.

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'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.