National Bank Open: Sara Bejlek vs Iga Swiatek

Platform comparison

Market context

Sara Bejlek’s meeting with Iga Swiatek is being priced like a one-sided WTA second-round match, with the crowd-implied 1% on Bejlek sitting well below recent bookmaker and model estimates. In comparable 2026 listings for this pairing, Swiatek has been quoted around 1.01–1.12 decimal, while Bejlek has sat in the 6.5–7.2 range or higher, and model-based win probabilities have clustered near 95% for Swiatek.[1][2][10] That gap matters for programme-style trading: if you are wiring a rules-based bot or conditional order chain, the baseline is not “close match” but “heavy favourite unless new information changes the state”.

For historical framing, the useful comparator is the pair’s earlier 2026 Grand Slam and WTA pricing, where the market repeatedly treated Swiatek as highly likely to advance and Bejlek as a longshot, with some opinion markets still giving Bejlek only a low-teens share of tipster support.[7][9][12] For a trader reading this programmatically, that means the current 1% is not a normal coin-flip drift; it is a tail outcome that would usually only compress towards parity if the fixture is withdrawn, not started, or materially disrupted under the market rules.

Catalysts to watch are operational rather than thematic: the official match start time, whether the fixture is moved within the National Bank Open schedule, and any late injury or withdrawal notice that changes the “advances” condition. Live schedule pages and scoreboards showed the match listed for 6 August 2026 in the women’s second round, so a bot should watch for status changes, walkovers, retirement flags and cancellation notices right up to the 7-day settlement cut-off.[1][6] If the match is not completed because one player advances via retirement or abandonment, that still resolves to the advancing player under the market terms, so the key dependency is not full match completion but whether a winner is officially recorded before the delay window expires.

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 Polymarket Review UK, 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

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 Review 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.

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.