National Bank Open: Terence Atmane vs Jakub Mensik

Platform comparison

Market context

Terence Atmane’s match with Jakub Mensik at the National Bank Open is being priced as a clear Mensik lean across the sports-betting stack, while the prediction market is more cautious. Kalshi is showing **35%** for Atmane and **65%** for Mensik, broadly in line with bookmaker prices that imply Mensik around the low-to-mid 60s and Atmane about one-third or less, depending on the book and vig. Dimers is even firmer on Mensik, putting him around **61.5% to 64%**, while Atmane-vs-Mensik moneylines in the market range from roughly +175 to +215 for Atmane and -188 to -255 for Mensik[1][2][3][7][9][10].

That leaves the current crowd-implied **17% YES** for Atmane well below both the sportsbook consensus and the modelled consensus, a gap that usually matters more when there is a credible angle on surface, fitness, or draw context. Mensik’s advantage is reflected not only in straight-match pricing but also in spread markets, where books and sportsbook derivatives cluster around Mensik covering games rather than a tight coin-flip match[2][9][16]. In comparable ATP match markets, the prediction-market number tends to move fastest when the gap between public sentiment and bookmaker price narrows, but here the distance is still material.

The main catalysts are scheduling and any late tournament bulletin that changes the match’s actual start or completion status. The market only resolves to 50-50 if the match is not played, tied, or delayed beyond seven days without a winner, so traders are watching for official order-of-play updates, weather interruptions, and any withdrawal or retirement news that could force a partial-play edge case[15]. Given the current setup, the most important live variable is not a new consensus on who is favoured, but whether the fixture proceeds cleanly and on time, since that determines whether the contract resolves on the winner or drifts into the fallback 50-50 outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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.

FAQ

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 PolyGram. 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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.