Bonn: Jan Choinski vs Jamie Mackenzie

Platform comparison

Market context

Jan Choinski’s ATP Challenger Bonn match against Jamie Mackenzie is priced as a near-certain Choinski win across both sportsbooks and the prediction market. Bookmakers are generally around 1.20–1.22 on Choinski and 4.00–4.56 on Mackenzie, while Kalshi shows Choinski at 78% and Jamie Mackenzie at 22%; Robinhood is even tighter, at 91¢ versus 9¢, so the market price is materially more bullish on Choinski than the exchange-style venue. [1][3][4][5]

That gap still sits within the normal shape of a mismatched Challenger contest: Choinski is the established ATP-level player, while Mackenzie is listed much further down the rankings and appears in the draw as a wildcard, which helps explain the one-sided line. Comparable pricing on TennisTemple and related odds feeds has kept Choinski around the low-1.20s, with only modest variation between books, suggesting the consensus is stable rather than drifting. [1][7]

The main catalysts are execution and schedule rather than any substantive form debate: if the match starts on time and Choinski takes the first set, the contract should harden towards a full settlement; if there is a late cancellation, prolonged delay, or incomplete match without a winner advanced, the market’s 50-50 fallback becomes relevant under the terms. Live scoreboards and event feeds already list the fixture for 2 August, with some slight timing differences between sources, so traders should watch for any order-of-play changes, retirement risk, or suspension announcements before the settlement window closes. [2][6][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Bonn: Jan Choinski vs Jamie Mackenzie 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.

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 Best Prediction Markets. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.