National Bank Open: Adam Walton vs Jenson Brooksby

Platform comparison

Market context

Adam Walton and Jenson Brooksby are due to meet in the National Bank Open, with the market currently pricing a **0% YES** chance on Walton advancing. That is materially lower than the live tennis data would suggest: ranking and form snapshots put Brooksby ahead in the ATP list, at roughly No. 77 versus Walton around No. 96-97, while pre-match comparison sites have also shown Brooksby as a moderate favourite rather than an overwhelming one.[1][5][9][13]

The historical frame is thin because the pair have no recorded head-to-head, so traders are leaning on comparables rather than direct matchup evidence.[2][5][6][13] On those comparables, Brooksby’s broader career record and hard-court win rate are stronger, but Walton has had enough recent results on the surface to avoid being dismissed entirely; that kind of profile usually supports a live underdog price well above zero rather than an implied certainty for one side.[2][7][13]

For catalysts, the key question is simply whether the match is completed and who officially advances, because the contract resolves to 50-50 if the contest is not played, ends level, or is delayed beyond seven days without a winner.[10] The event was listed for Montreal on 3 August, and scoreboards from Flashscore, Sofascore and Tennis.com all placed it on the tournament schedule, so any late withdrawal, walkover, weather disruption or rescheduling would matter more here than marginal pre-match form data.[1][5][9][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open: Adam Walton vs Jenson Brooksby across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Best Prediction Markets, which mirrors the Polymarket order book at 0% fees.

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.

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.

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