National Bank Open: Terence Atmane vs Jakub Mensik

Platform comparison

Market context

The market is about a third-round National Bank Open match between Terence Atmane and Jakub Mensik in Montreal, with the official event page showing the fixture listed for 7 August on Rogers Court.[2] Programmatically, this is the sort of market a bot should treat as a live event-state problem rather than a pure pricing call: the key inputs are whether play starts, whether it finishes, and whether any default, retirement or schedule slip forces the settlement rules away from a straight winner call.[2][5]

The near-zero crowd-implied probability is easiest to read as a stale or mispriced state, because the underlying tennis signals are not remotely close to a 0% outcome for either side. Mensik is the higher-ranked player in the live match listings, at ATP No. 17 versus Atmane around the mid-40s to mid-50s, while both pre-match and live stat pages frame the contest as a genuine third-round matchup rather than a mismatch.[1][3][16] Comparable hard-court profiles also point to a competitive draw: Mensik’s 2026 hard-court record is stronger, but Atmane has still posted a respectable hard-court season, so an automated model would normally avoid treating either player as functionally dead on arrival.[6][15][18]

The main catalysts to watch are simple operational ones: official tournament status, start-time movement, and any indication that the match has been postponed, suspended or completed by retirement.[2][5] Because the market rules switch to 50-50 if the match is not played, ends tied, or slips more than seven days without a winner, a workflow using conditional orders or alert bots should key off the tournament feed and live score state, not just player news.[2][5] If the first ball is struck, the settlement logic changes again, so the most important check is whether the match actually begins and reaches a terminal winner.

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

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.

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 Polymarket Bot 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.

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%.