National Bank Open: Sara Bejlek vs Iga Swiatek

Platform comparison

Market context

Sara Bejlek’s match with Iga Swiatek at the National Bank Open has drawn a **0% YES** crowd price, which is consistent with a heavy favourite/longshot split rather than a genuinely even contest. Swiatek already leads the head-to-head **1-0**, having beaten Bejlek in straight sets at Roland Garros in May 2026, and the scoreline was one-sided enough to reinforce the gap in class between the two[1][10][13]. Independent tennis databases also show Swiatek with the stronger year-to-date and last-12-month win rates, while Bejlek’s profile remains that of an improving but still erratic lower-ranked player[1][8]. On that basis, the prediction market is broadly aligned with the kind of price you would expect from the sportsbook side, where elite-player moneyline favourites are often pushed into very short odds and the underdog only becomes interesting if the favourite is carrying an injury or is rotated out[17].

For traders, the key catalyst is simple: whether the match is actually played on schedule, and whether Swiatek is confirmed in the draw and on court. The market description makes settlement highly sensitive to postponement or cancellation, since a match not played at all, or delayed beyond seven days without a winner, resolves 50-50. That means any late withdrawal, weather backlog, or scheduling change matters as much as tennis form. Recent tournament listings and live match pages still show the pairing as scheduled in Toronto, but those feeds do not guarantee final order-of-play stability in a busy WTA week[2][6][11]. If sportsbook lines stay effectively unopposed while the contract remains pinned at 0% YES, that usually indicates the market is treating Bejlek’s path to advancement as close to negligible unless a late breaking lineup or fitness update changes the setup[14][17].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Sara Bejlek vs Iga Swiatek across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 vs Polymarket. 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.

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.