National Bank Open: Liudmila Samsonova vs Barbora Krejcikova

Platform comparison

Market context

Liudmila Samsonova and Barbora Krejcikova are scheduled to meet in the National Bank Open second round in Toronto, and the market’s **100% YES** price is far above the rest of the field. Cross-checks point the other way: Kalshi’s contract shows Krejcikova around **64%** and Samsonova around **36%**, while bookmaker screens cluster closer to Krejcikova at roughly **61-62%** and Samsonova at **38-39%**. Tennis.com’s match page also lists Krejcikova as the projected winner at **68%**, so the prediction-market line is substantially more optimistic on a Samsonova advance than both sportsbook consensus and analyst models.[1][11][18][6]

That gap is easier to read in light of the match-up’s recent history and pre-match models. A current Tennis.com result page shows Samsonova winning this Toronto meeting in straight sets, but the surrounding pre-match pricing from independent models still tilted to Krejcikova, with String Tension’s Elo estimate at **73.8%** for Krejcikova and other preview sites calling her the favourite.[3][2][5][7][13] In other words, comparable cases suggest the market can move sharply on late information, but the baseline read from analysts and books has consistently been a Krejcikova edge rather than a near-certainty for either player.[11][17][19]

For traders, the key catalysts are straightforward: the match status itself, the confirmed starting time, and any Toronto-specific disruption that could trigger the settlement rules. The listed start time appears in the 5 August match pages, and the market description says a cancellation, tie, or a delay beyond seven days without a winner would settle 50-50, so any postponement or walkover risk matters more here than in a standard moneyline market.[1][18] The strongest live signals will be official tournament scheduling updates, withdrawals, and any shift in matchup availability before the settlement window closes on 13 August 2026.[1][18]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

UK Frequently Asked Questions

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.

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.

What are the best prediction markets for UK traders in 2026?

For UKGC-regulated markets: Betfair Exchange (sports, politics) and Smarkets (sports, politics, lower commission than Betfair). For broader global event prediction: Polymarket (deepest liquidity, 0% fee, USDC settlement). For US-regulated option: Kalshi (USD, limited UK payment options). Most serious UK traders use a combination of Betfair for regulated sports and Polymarket for broader markets.