National Bank Open: Jacob Fearnley vs Adrian Mannarino

Platform comparison

Market context

Jacob Fearnley’s meeting with Adrian Mannarino at the National Bank Open has been priced as a narrow Fearnley lean in conventional markets, even though the prediction contract is sitting at a crowded 100% YES. Current bookmaker averages were around 1.55 for Fearnley and 2.41 for Mannarino, while Tennis.com’s model had Fearnley at 61% and Mannarino at 39%, a much more modest edge than the market-implied certainty suggests.[1][2]

That gap matters because tennis first-round prices at ATP Masters level often move quickly on simple timing issues rather than deep re-rating: if the match is postponed, rescheduled or not started, settlement can shift away from the outright winner and towards the contract’s contingency rules. Comparable listings also showed the contest still marked as upcoming on 3 August, with the late scheduling status creating more uncertainty than the pre-match odds alone imply.[6][8] The most relevant comparable case is therefore not a blowout favourite, but a standard ATP hard-court opener where market prices reflect competitive uncertainty, while the prediction market appears to be assuming completion as scheduled.[1][6]

Traders should watch for any official tournament updates on order of play, weather-related delays, and whether the match is moved beyond the seven-day window that would force a 50-50 outcome under the contract terms. Live sports listings on 4 August still treated the match as active in the tournament feed, which points to scheduling rather than cancellation risk as the main catalyst.[7][9] If play starts, the key dependency is simply whether a winner is recorded before the settlement deadline; if not, the market’s conditional clause becomes the decisive factor.

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 Kalshi vs Polymarket, 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 Kalshi vs Polymarket. 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.