National Bank Open: Botic van de Zandschulp vs Jakub Mensik

Platform comparison

Market context

Polymarket is pricing Botic van de Zandschulp to win this Montreal round-of-16 match at about **28%**, which means Jakub Mensik is the clear market favourite on the contract side. The market settles on the match result, with the usual Polymarket mechanics underneath: USDC collateral, Polygon settlement, and conditional tokens that pay out according to the verified outcome.

That price fits the broader tennis read. Mensik comes in as the younger, higher-ranked player and has been listed around the low-70s by several match previews, while van de Zandschulp has been treated as the underdog despite a strong run to reach this stage.[2][4][11] The first-set and match-win markets in comparable feeds also sit near that split, with one live match preview showing roughly 90.7% for Mensik and 9.3% for van de Zandschulp, while another sportsbook-style projection has Mensik around 70%.[2][4] With no prior tour-level head-to-head, the market is leaning more on ranking, recent form and surface suitability than on matchup history.[2][3][14]

For traders, the main catalysts are straightforward: final match scheduling, any late court assignment changes, and whether the event remains on track inside the seven-day settlement window. The official National Bank Open listing places the match on 9 August 2026, while other feeds show a Montreal evening start that can move with the tournament order of play.[6][7][10] If the match is delayed, suspended or not completed within the allowed window, the contract’s fallback logic matters as much as the on-court score, because a no-result can push settlement to 50-50 rather than either player.[9]

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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.