National Bank Open: Jacob Fearnley vs Jakub Mensik

Platform comparison

Market context

Polymarket’s USDC contract is pricing **Jacob Fearnley to advance at 75%**, which leaves Jakub Mensik at 25% on the other side of the conditional token pair. The market is being traded on Polygon, so the price reflects where USDC buyers think the settlement outcome will land once the match is resolved or, if it is not completed in time, whether the contract falls into its 50-50 fallback rules.

The historical frame is straightforward: these two have **no prior head-to-head meeting**, so the market is leaning mainly on form, ranking and surface performance rather than any direct matchup evidence.[1][3][8] Mensik comes in as the higher-ranked player and has the stronger overall record, with roughly **61% career wins** versus Fearnley’s roughly **40%** in one head-to-head database, although another source shows Fearnley improving over the last 52 weeks and both men posting broadly similar hard-court numbers.[1][2][6] That split helps explain why a market price can sit well below a pure ranking gap while still favouring Fearnley materially.

For traders, the main catalysts are the ATP schedule and whether the match is actually played, because the market only resolves to a winner if one advances and drops to **50-50** if the match is cancelled, tied, or delayed beyond seven days without a decision. The pair is listed for the National Bank Open in Montreal, with live score and fixture pages indicating the tie is on the day’s order of play, so any rain delay, withdrawal or reshuffle matters directly to settlement.[3][4][6][8] Mensik’s broader 2026 hard-court record and Masters 1000 pedigree, including his Miami title in 2025, are the main reasons the 75% line is not a clean sweep for Fearnley despite the current market lean.[6][15]

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

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.

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%.