National Bank Open: Jacob Fearnley vs Adrian Mannarino

Platform comparison

Market context

Jacob Fearnley’s meeting with Adrian Mannarino at the National Bank Open is priced very differently across markets, but the broad directional view is the same: Fearnley is the favourite. Prediction-market style models and preview sites lean towards Fearnley, with Tennis.com showing a 61% projected winner probability and Tennis Tonic/Ruedesjoueurs pricing him around 1.56-1.58 in decimal odds, which implies roughly a 63-64% win chance before margins.[3][14][16] That sits a long way from the crowd-implied **100% YES** on this contract, so the main cross-platform divergence is not between sides, but between a hard near-certainty in the market and a more conventional favourite/underdog split elsewhere.[3][14][16]

For context, that kind of gap is typical when a market has already absorbed one outcome heavily or when trading has been thin: tennis previews often leave room for a live underdog chance even when the favourite is clear on paper. ATP ranking data in the TennisTemple listing shows Mannarino as the higher-ranked player at ATP No. 47, with Fearnley listed at No. 110, which is one reason many analysts would avoid treating this as a one-way match-up despite the Fearnley lean.[2] Historical framing therefore points to a straightforward but not deterministic contest, especially if the market is resolving from “advances” rather than an all-or-nothing completed-match result.[2][3]

The main catalysts are operational rather than form-based: official schedule updates, court assignment, and whether the match was started, completed, or pushed back beyond the settlement window. Several live scoreboards and match pages show the fixture as scheduled around 3-4 August 2026, but they do not by themselves confirm completion, so traders should watch the tournament order of play and any ATP or broadcaster updates for postponement or abandonment risk.[1][4][5][9] If the match is delayed beyond seven days from the scheduled date without a winner, the contract goes to 50-50 under the rules, so schedule slippage is the key binary dependency rather than pre-match forecasting alone.

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 Best Prediction Markets UK, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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 Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.