National Bank Open: Sara Bejlek vs Iga Swiatek

Platform comparison

Market context

Iga Swiatek’s scheduled meeting with Sara Bejlek at the National Bank Open is being priced as a near-certainty by the market, with the crowd-implied probability at 0% YES despite the obvious mismatch in profile and ranking. That looks consistent with the wider tennis consensus: Swiatek beat Bejlek 6-2, 6-3 at Roland Garros in May 2026, and the official tournament stats showed a clear edge in first-serve points, return points and break-point conversion[8][16]. Bejlek’s season record is respectable, but Swiatek’s longer-run level remains far higher, with tennis-stat aggregates showing a strong 2026 win rate and a dominant head-to-head lead[1][9].

For traders, the main issue is less about match quality than whether the fixture is actually played on schedule. The contract resolves 50-50 if the match is cancelled, ends level, or is delayed beyond seven days without a winner, so any weather disruption, court backlog, withdrawal, or medical timeout affecting the event timetable matters more than small price moves in the tennis market itself. Live-score and tournament listings already show the matchup in the event set-up, but the key dependency is official order-of-play confirmation and any late player-news from the National Bank Open draw sheets or match centre updates[4][7]. If sportsbooks publish a number, it is likely to sit very close to Swiatek-heavy territory, leaving the main divergence here between an extreme prediction-market probability and a more conventional pre-match trading line.

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 Best Prediction Markets 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 Best Prediction Markets 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.

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.