US Open, Qualification ATP: Francesco Passaro vs Felix Gill

Platform comparison

Market context

Francesco Passaro and Felix Gill are scheduled to meet in US Open qualifying, with the draw listing Passaro as the Italian seed in the pairing and Gill as the British opponent on hard court in New York.[1][3] In market terms, a 100% YES price implies an almost certain expectation that the match is completed and produces a named winner rather than a void or tie, which matters because this event only resolves 50-50 if it is not played, ends without a winner, or remains unsettled past the deadline.

That kind of pricing is easier to read against venue and draw context than against any single pre-match line. The two players are close in profile on the draw sheet, and third-party tennis listings had the contest effectively near coin-flip territory before play, with one pre-match projection giving Gill a narrow edge and another showing Passaro and Gill tightly matched.[1][2] On exchanges, that would usually show up as decimal odds rather than a simple probability, while on Polymarket the headline number is the implied probability itself; Kalshi and Betfair also add different frictions, with Kalshi requiring US KYC and Betfair charging exchange commission, so the same underlying view can land at different effective prices.

The key catalysts are operational rather than narrative: whether the match was actually started, completed, or postponed again, and whether any official scoreline or withdrawal was posted before the settlement window closes on 31 August and the fallback date in early September.[1][4] The US Open qualifying draw was published on 23 August, and live score services listed the match for 24 August on Court 16, so the main dependency is tournament scheduling rather than form news.[1][4] In practice, traders watch for official draw updates, walkover notices, and live scoreboard status, since those determine whether this settles to Passaro, Gill, or the 50-50 fallback.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares US Open, Qualification ATP: Francesco Passaro vs Felix Gill specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.