Bonn: Jan Choinski vs Jamie Mackenzie

Platform comparison

Market context

Polymarket is pricing **Jan Choinski** at **100% YES** for this contract, which on a USDC-settled, Polygon-based conditional token market means traders are effectively treating a Choinski advance as already locked in unless an administrative edge case intervenes. The underlying event is a Bonn clay-court match between Jan Choinski and Jamie Mackenzie, listed to start at Centre Court in Bonn, with Choinski shown around ATP No. 88 and Mackenzie around ATP No. 931 in live event listings.[1][6][8]

That 100% print is consistent with the wider market picture: comparable tennis event pages and live-score feeds have already shown Choinski leading or finishing the match, and one match report records a final result of Jan Choinski 1-0 Jamie Mackenzie.[3][4] In practical prediction-market terms, once a result is posted and the match is completed, the conditional token that pays on Choinski should resolve straightforwardly; only a cancellation, tie, or a delay beyond the market’s seven-day window would push settlement towards the 50-50 fallback described in the contract.

The key trader watchpoints are therefore operational rather than sporting: official score confirmation, whether the fixture was completed on court, and whether any tournament scheduling or data-feed discrepancy appears before the settlement window closes. For a contract already at 100% YES, the main catalyst is a contrary administrative update, not a fresh on-court development, because once the organiser’s result and the market’s resolution rules align, there is little room left for repricing.[1][4][13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Kalshi UK. 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK 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.