National Bank Open: Terence Atmane vs Jakub Mensik

Platform comparison

Market context

Terence Atmane and Jakub Menšík are scheduled to meet in the National Bank Open, and the market is pricing Atmane at **37% YES**, which is materially below the consensus seen in conventional books. Across posted moneylines, Mensik is generally around 1.42-1.49 decimal while Atmane sits closer to 2.60-3.02, implying roughly a 67-71% chance for Mensik before bookmaker margin; Tennis Temple’s aggregated odds and multiple sportsbook screens point the same way, and Tennis Tonic also lists Mensik as the pick.[2][1][18]

For a comparison with Polymarket, the key distinction is that Polymarket shows a straight *YES* price rather than a tradable decimal line, while Kalshi-style markets present contract prices in cents and often separate adjacent derivatives such as game spreads.[4][16] On this match, that matters because the listed 37% implies a notably shorter Atmane view than the mainstream betting market, where Mensik is favoured decisively; that gap can reflect platform liquidity, fee treatment, and whether traders are anchoring to pre-match probability or to a more volatile in-play view. Smarkets and Betfair-style exchange markets usually quote decimal odds and may expose a different effective price after commission, but the underlying direction here remains the same: Mensik is the stronger pre-match favourite.[2][6]

The main catalysts are straightforward: whether the match actually starts on schedule, whether the National Bank Open draw is updated, and whether either player withdraws or retires, because the settlement rules send a non-played, tied, or heavily delayed match to 50-50. Flashscore and tournament listings show the fixture as a same-day match, so traders should watch official order-of-play updates and live scoring rather than assume completion; if the match begins but is not finished, the advancing player determines settlement.[6][15]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read National Bank Open: Terence Atmane vs Jakub Mensik from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

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.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

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.