National Bank Open: Adam Walton vs Jenson Brooksby

Platform comparison

Market context

Polymarket is pricing this contract at **0% YES** on USDC-settled conditional tokens on Polygon, which is consistent with a market where the match is either not yet resolved on-chain or where traders expect the “Adam Walton advances” outcome to be very unlikely. In practical terms, the contract only pays out if the tournament result is recorded within the settlement window; if the match is cancelled, left without a winner, or delayed beyond seven days, the market resolves 50-50 under the stated rules.

The live tennis market context points the other way from the current Polymarket price. Public sportsbook and model references around the match have generally made Jenson Brooksby the narrower favourite, with quoted prices clustering around Brooksby 1.66-1.76 and Walton 2.10-2.20, while one model gives Brooksby about a 55% win chance and Walton about 45%.[1][2][9][11][13] That kind of spread is not unusual for ATP early-round pricing, but it does mean a 0% YES reading on Walton looks detached from the sporting consensus unless there is a special settlement issue, a mispriced contract, or unresolved event risk.

A trader should watch the official order of play, any late withdrawals, and whether the match is moved after the original August 3 slot, because those details determine whether the on-chain token settles to a player or flips to the fallback 50-50 outcome. The Athletic’s August 2 schedule note listed Walton v Brooksby for 2:30 p.m. ET in the round of 128, and tennis listings have continued to show the pairing on Court 9, so the key catalyst is simply whether the match is actually completed and officially advanced by the ATP event feed rather than how the pre-match odds move.[7][1][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Adam Walton vs Jenson Brooksby 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

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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.

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.