Canadian Open: Sebastian Baez vs Mattia Bellucci

Platform comparison

Market context

Sebastian Báez versus Mattia Bellucci is a first-round men’s singles match at the Canadian Open on outdoor hard courts in Montreal, with the pair listed around ATP No. 53 and No. 81 respectively, and no prior head-to-head meetings on record.[1][2] That makes the crowd’s 100% implied probability unusually absolute for a matchup that still sits at the start of the draw, especially given that books and exchange-style venues tend to price first-round ATP matches as favourites rather than certainties when one player is better ranked but neither has a direct head-to-head edge.[1][2][18]

For platform comparison, Polymarket-style markets express outcome as a binary implied probability, so a 100% price effectively leaves no room for schedule risk, retirement risk or walkover uncertainty; by contrast, Kalshi, Betfair and Smarkets typically show decimal odds, where the same view would appear as a very short price and traders can more easily compare the margin embedded in each book. In practice, that matters here because a “Baez advance” settlement can still be upset by cancellation, a no-contest, or a delay beyond seven days, all of which would force a 50-50 outcome under the market rules even if the market had been priced as a near-lock before play.[2][18][19]

The main catalysts are administrative rather than tennis-specific: confirmed court time, whether the match has actually begun, and any withdrawal or postponement updates from the tournament schedule or live score services.[1][3][6] Recent listings have already shown variation in published start times across venues and feeds, which is a reminder that settlement follows the actual match state, not the first posted time, and that a delayed or rescheduled first-rounder can move from a straightforward favourite to a split-result if it slips beyond the seven-day window.[1][3][6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Canadian Open: Sebastian Baez vs Mattia Bellucci 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 Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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.

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.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.