National Bank Open: Liudmila Samsonova vs Barbora Krejcikova

Platform comparison

Market context

Polymarket is pricing the contract at **100% YES**, so the market is effectively treating Liudmila Samsonova to advance over Barbora Krejcikova as a done deal. On Polymarket, this contract settles in USDC on Polygon through conditional tokens, so the only thing that matters is the official match outcome under the market rules, not who looks stronger on paper.

The tennis context is still useful for reading why the order has drifted this far one way. Samsonova has already beaten Krejcikova on clay in Strasbourg, winning 6-2, 6-7(5), 6-4 in three hours, while recent match previews also show Samsonova with the historical edge in the head-to-head and on hard courts[1][12][6]. At the same time, Krejcikova arrives as the higher-ranked player and several live previews still frame her as the favourite, which suggests the current 100% price reflects contract mechanics and event status more than a balanced view of the matchup itself[3][7][8].

For traders, the key catalysts are straightforward: whether the match starts on schedule, whether there is any late withdrawal or walkover, and whether tournament timing changes push the result beyond the settlement window. Current listings place the match on Court 1 in Toronto on 5 August UTC, but the market description also allows a 50-50 outcome if it is cancelled, tied, or delayed beyond seven days without a winner, so any scheduling disruption matters as much as the on-court result[1][4][5]. The main dependency is the official WTA/National Bank Open order of play and whether both players are confirmed to take the court[1][3].

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.

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.

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.