National Bank Open: Jiri Lehecka vs Alexander Blockx

Platform comparison

Market context

Jiri Lehecka is priced as the clear favourite against Alexander Blockx in Montreal, and the crowd-implied 87% Yes on this market is notably firmer than the main sportsbook and forecast benchmarks in the search results. Recent pricing around the match has Lehecka around 62%-64% to win on Kalshi-style probability boards, while conventional books have him roughly in the 1.5-1.6 decimal-odds range, which equates to a shorter favourite than Blockx but not an 87% proposition.[17][14][4]

That gap matters when comparing platforms. Polymarket-style contracts quote directly in cents, Kalshi shows an explicit probability plus cents pricing, while sportsbooks and exchanges such as Betfair or Smarkets translate the same view into decimal odds and then apply different fee or commission models; on a one-sided tennis match like this, the headline percentage can therefore look higher on a prediction venue than the bookmaker-implied chance after margin. KYC and access also differ by venue and jurisdiction, so the same matchup can be available to a different customer base at different effective prices, even before any commission is paid.[17][3][4]

For traders, the main catalysts are straightforward: final confirmation that the match is played as scheduled, any draw-order or court-time changes, and the possibility of a postponement or retirement that pushes settlement into the market’s special rules. Because this market resolves to 50-50 if the match is not played, or if a delay extends beyond the stated window without a winner, late schedule disruption is more relevant here than in a standard outright bet; by contrast, if one player is declared the advancing player after a partial match, that determines settlement regardless of the scoreline.[3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares National Bank Open: Jiri Lehecka vs Alexander Blockx specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

UK Frequently Asked Questions

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Polymarket vs Betfair Exchange: which is better for UK prediction trading?

Betfair Exchange offers UKGC regulation, GBP settlement, and potentially tax-free winnings — but focuses on sports and politics only. Polymarket has deeper liquidity, 0% platform fee, global event coverage, and crypto/geopolitical markets Betfair doesn't offer. For UK traders: Betfair for regulated GBP sports markets; Polymarket for broader, global prediction events.

Is Kalshi available in the UK?

Kalshi is a US CFTC-regulated prediction exchange. UK residents can create accounts but must use USD and US payment methods. Kalshi's product range overlaps with Polymarket but with lower liquidity on most contracts. For UK traders, Polymarket typically offers better prices due to higher global volume.