National Bank Open: Sara Bejlek vs Iga Swiatek

Platform comparison

Market context

Sara Bejlek’s National Bank Open meeting with Iga Świątek is a second-round WTA 1000 match on hard courts in Toronto, with the tournament listing it at Centre Court and multiple schedules placing it around 18:30 local time on 4 August. The market’s 0% crowd-implied YES price is hard to reconcile with the tennis context: Świątek is ranked world No 8 and Bejlek No 38, but the pair have already met once this year, with Bejlek winning their French Open clash in straight sets.[1][2][3][5][8][17]

For comparison across platforms, Polymarket typically shows a raw implied probability, while Betfair and Smarkets usually present decimal prices or exchange odds, so the same view can look very different after fees and commission. In a spot like this, the headline number on one venue can undershoot the actual trading interest elsewhere if liquidity is thin, and access also differs because exchange-style books often require stricter KYC and jurisdictional checks than a crypto-native market. The prior head-to-head matters because it is a real comparator, but the French Open result came on clay, not the Toronto hard courts that usually favour Świątek’s baseline power and return game.[2][4][15][16][18]

The main catalysts are simple: confirmation that the match actually starts, the order of play, and any late withdrawal or walkover news. If the contest is delayed beyond seven days from the scheduled date without a winner, this market settles 50-50, so traders are watching whether the tournament keeps the fixture on the same-day programme or shifts it after any weather or scheduling disruption. Broad match listings from the event and media outlets currently show it as an upcoming second-round fixture rather than a completed result, so any official change to the draw or schedule would be the most direct driver of repricing.[8][10][11][12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares National Bank Open: Sara Bejlek vs Iga Swiatek specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.