National Bank Open: Sara Bejlek vs Iga Swiatek

Platform comparison

Market context

Iga Swiatek’s second-round match with Sara Bejlek at the National Bank Open is scheduled for Toronto, and the market is pricing a Bejlek upset as highly unlikely. The contract’s 1% YES implies the crowd sees Swiatek advancing as the base case, which is broadly consistent with the pre-match framing in match notes showing Swiatek ranked at No. 8 and leading the head-to-head 1-0.[18][2]

That low price also fits the way comparable WTA mismatches tend to trade: when a top-10 player meets a lower-ranked opponent, prediction markets usually sit well below 10% for the underdog unless there is injury news or a major scheduling complication. One published preview called Swiatek the clear favourite and pointed towards a straight-sets result, while live score and fixture pages also list Swiatek as the higher-ranked player entering the match.[10][2][4]

The main catalysts for traders are timing and completion risk rather than a form reversal. The match is listed for 4 August in Toronto at 18:30 local time, and the market rules mean a non-played match, a tie, or a delay beyond seven days would settle 50-50, while a match that starts but is unfinished would still resolve to the player who advances.[3][5] With the event already on the schedule and live coverage pages active, the key watch items are any last-minute withdrawal, a revised order of play, or weather-related postponement that pushes the contest outside the seven-day window.[1][3][4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.