Canadian Open: Sebastian Baez vs Mattia Bellucci

Platform comparison

Market context

Polymarket is pricing the Baez-Bellucci match as a near-certainty on the **YES** side, with the contract effectively implying that Sebastian Baez is the expected advance for settlement in USDC on Polygon through conditional tokens. That is far above the sort of split usually seen in a competitive ATP first-round market, where the exchange price would normally move if the underlying match is still live, rescheduled, or exposed to retirement risk before the seven-day settlement cut-off.

Recent comparable pricing around the same fixture has been much tighter than 100% in external markets: Dimers had Bellucci at 51.9% and Baez at 48.1%, while other previews leaned modestly towards Baez rather than treating the result as locked in.[9][10][3][8] Kalshi’s own related market also sat much lower, with Baez around 53% and Bellucci around 43%, which suggests the current Polymarket price is being driven less by pure win probability and more by settlement certainty or stale order-book positioning.[12] In tennis, that matters because a completed match, a retirement after play starts, or a postponement can all change how conditional tokens resolve, even when one player looks favoured on paper.

For traders, the key catalysts are the ATP/Canadian Open schedule, any official court-time change, and whether either player has already advanced, withdrawn, or been moved in the draw. Flashscore and SofaScore both list the meeting as a live scheduled fixture, but if the match is not played, ends without a winner, or slips beyond seven days from the original date, the market’s fallback 50-50 rule becomes relevant.[2][4] Because the contract settles only on the advancement outcome, any tournament announcement or draw correction that changes who actually proceeds will matter more than headline pre-match odds.

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 Kalshi UK, 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 Kalshi UK. 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.

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 Kalshi UK 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.