Canadian Open: Kamil Majchrzak vs Gael Monfils

Platform comparison

Market context

The market is still pricing Kamil Majchrzak as the likelier winner after the opening round was scheduled for 3 August, with the crowd at 76% for Majchrzak and 24% for Gael Monfils. That sits above several pre-match models and bookmakers, which clustered more in the high-60s to mid-70s for Majchrzak rather than an overwhelming favourite, so the current price is directionally consistent but slightly firmer than some external baselines.[13][16][17]

Historically, this kind of number has tended to reflect a modest edge rather than a locked-in result: Majchrzak is the more favoured side across recent prediction models, while Monfils still attracts enough support to keep the upset live if the match turns into a longer, more physical contest. Comparable pre-match markets on this fixture have also leaned Majchrzak, including prices that implied roughly a two-in-three to three-in-four chance, which makes a 76% reading plausible but not immune to movement if late information shifts the draw view.[3][12][16]

For traders, the main catalysts are simple: official tournament scheduling, any update on whether the match has actually started, and whether either player is withdrawn, postponed or forced into retirement before a winner is recorded. Live score feeds show the fixture as an active event, while sportsbook pages continue to post match odds, which suggests the decisive variable is completion rather than pre-match uncertainty; if play is not completed and advancement is awarded, that matters for settlement, whereas a cancellation or delay beyond seven days would push the market to 50-50 under the stated rules.[2][4][7][11]

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

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

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.

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.