National Bank Open: Jiri Lehecka vs Alexander Blockx

Platform comparison

Market context

Jiri Lehecka has remained a clear favourite into match day against Alexander Blockx, and the market’s 95% YES price is much stronger than the external betting and model estimates, which have generally placed Lehecka around the low- to mid-60s to low-70s in win probability. That gap matters: it suggests the market is pricing something closer to certainty than the broader tennis market, where Lehecka has been listed around -184 to -222 and Blockx around +175 to +179 in recent previews. [1][14][16]

The historical framing is straightforward: Lehecka’s ranking and seeding advantage over Blockx has been reflected in most pre-match projections, with bookmakers and prediction models consistently making him the likely winner rather than treating this as a close coin flip. Comparable cases in ATP Masters hard-court matches often see favourites shortened further once line-ups are confirmed and late money follows the top seed, but the current crowd-implied level is already near the top end of that range, so the key question is whether the price is simply reflecting a routine favourite or overstating certainty. [1][8][16]

For traders, the main catalyst is whether the match actually starts and finishes as scheduled, because a retirement or a postponement beyond the seven-day window would push settlement towards 50-50 under the rules. Flashscore had the contest listed as underway late on 6 August with Lehecka leading, which reduces cancellation risk but leaves completion and official advancement as the decisive dependency; any medical timeout, retirement, or schedule disruption would matter more here than fresh pre-match opinion. [3][4][17]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Jiri Lehecka vs Alexander Blockx across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

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%.