National Bank Open: Sara Bejlek vs Iga Swiatek

Platform comparison

Market context

Polymarket is pricing **Sara Bejlek vs Iga Swiatek** at **0% YES** today, so the contract is effectively treating a Bejlek advance as an extreme outlier and a Swiatek advance as the base case. On Polymarket, that exposure sits inside a USDC-settled, Polygon-based conditional token contract, so the market only resolves on the match outcome or the listed fallback rules if the fixture is not completed as scheduled.

That low price is consistent with the on-court frame already available: Swiatek leads the head-to-head 1-0, having beaten Bejlek 6-2, 6-3 at Roland Garros in 2026, and the National Bank Open listings place them in the second round in Toronto.[1][2][3] Comparable WTA markets with a top seed against a lower-ranked opponent often trade near zero when the favourite has already handled the matchup cleanly, because traders are pricing both class gap and the fact that the contract only needs one player to advance, not a full completed match.[1][2]

The main catalysts are practical rather than speculative: official order-of-play updates, any rain or scheduling shift, and confirmation that the match is actually completed before the 7-day delay threshold that would push the market to 50-50 under the rules. Tournament and live-score pages show the fixture as a Toronto second-round meeting, originally set for 4 August at 18:30, while broadcast listings also anchored it to that slot, so any deviation in completion status is the key event for holders of the USDC position.[7][9][10][12] Recent score feeds and match pages indicate the contest was tracked as a live WTA 1000 event, which matters because a retirement, walkover, or abandoned start can change settlement even if play began.[4][14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open: Sara Bejlek vs Iga Swiatek across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 Polymarket Alternative UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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.