National Bank Open: Sara Bejlek vs Iga Swiatek

Platform comparison

Market context

Polymarket is pricing this tennis contract at **0% YES**, which means the market is assigning no current weight to Sara Bejlek advancing over Iga Swiatek. On Polymarket, that view is expressed through USDC on Polygon and settled via conditional tokens, so the live price is the crowd’s snapshot of who it expects to be the winner rather than a forecast of the broader tournament narrative.

The historical frame is straightforward: Swiatek already beat Bejlek in their only completed head-to-head, a straight-sets win at Roland Garros in May 2026, with Swiatek leading 1-0 in the matchup overall[3][15]. The statistical gap is also consistent with the market’s current pricing: Swiatek is the higher-ranked, higher-winning-percentage player across the cited form guides, while Bejlek has the smaller résumé and lower career win rate in comparison[1][9]. A 0% quote does not mean the contract cannot move; it usually means traders see the outcome as so lopsided that even a small probability is not being bid in.

For traders, the main catalysts are simple and mechanical: whether the match is actually played, whether either player withdraws, and whether the tournament schedule slips beyond the market’s seven-day settlement window, which would push the contract towards its 50-50 fallback rules. The National Bank Open match listing shows the pairing in Toronto, with live score and match-detail pages already tracking the fixture, so any official change in draw status, walkover, retirement, or postponement would be the key trigger for repricing[11][18]. Because the market resolves on advancement rather than match completion, a partial match that ends in a walkover still matters for settlement, while a cancelled or excessively delayed fixture does not.

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 PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.