National Bank Open: Karen Khachanov vs Terence Atmane

Platform comparison

Market context

Karen Khachanov’s match with Terence Atmane at the National Bank Open is priced around a modest Khachanov edge, but the market is not treating it as a one-way outcome. TennisTemple lists average bookmaker odds of 1.68 for Khachanov and 2.18 for Atmane, which implies roughly a 60% raw win chance for Khachanov before margin, while the crowd-implied 56% YES on Polymarket is a little softer than that consensus.[1] Kalshi is also showing Khachanov as favourite, with its match market quoting 71¢ for Khachanov YES and 67¢ for Atmane YES, while Robinhood’s linked set markets underline that the event is being traded in a different format there, with per-contract cents rather than a single match-moneyline style price.[9][10]

For comparison, Betfair’s listed decimal price of 1.67 for Khachanov on TennisTemple is close to Bet365 and William Hill, while Smarkets-style display conventions typically translate directly into implied probability and are easier to compare with prediction markets than American odds, though fee treatment still matters.[1] The key practical divergence is that Polymarket and Kalshi show an explicit probability, whereas exchange books like Betfair and Smarkets are usually read through decimals or back/lay prices, and the all-in edge depends on commission; for a US-based trader, KYC and access also differ materially, with exchange availability and jurisdiction limits often tighter than on crypto-native venues.[1]

The main catalysts are straightforward: the match must actually be played and completed, because if it is cancelled, left without a winner for more than seven days, or otherwise hits the market’s non-completion rules, settlement moves to 50-50 rather than either player.[Market description] Tennis.com lists the fixture as a Round 2 match in Montreal, and live or late schedule changes matter because ATP events can shift court order, daylight, and weather backlogs quickly.[8] A trader should therefore watch the official order of play, any withdrawal notices, and whether one player is already progressing through the draw, since those are the factors most likely to change the settlement path more than the pre-match pricing itself.[8]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read National Bank Open: Karen Khachanov vs Terence Atmane 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

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.

FAQ

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.

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.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.