National Bank Open: Jenson Brooksby vs Ben Shelton

Platform comparison

Market context

Jenson Brooksby’s meeting with Ben Shelton at the National Bank Open is a second-round hard-court match that the market has priced as heavily Shelton-favoured, but not uniformly across venues. Kalshi shows Shelton around 76% to win, while the contract’s crowd-implied probability is marked at 0% YES, a clear disconnect from both sportsbook-style pricing and analyst previews that lean Shelton. [15][10][11]

The historical frame also points towards Shelton. He is the higher-ranked player by some margin in the current tournament listings, and pre-event title markets placed him among the stronger outsiders behind the leading seeds, whereas Brooksby has been priced as a much longer shot in prior Toronto/Montreal markets. Independent match previews have also picked Shelton, often in three sets, which suggests consensus expects Brooksby to compete but not to be favoured to advance. [1][6][9][11][12]

For traders, the main catalysts are straightforward: official order of play, any court-time changes, and whether the match actually starts within the settlement window. The contract’s resolution terms matter because an abandoned or unplayed match can still resolve 50-50 if it is cancelled, tied, or delayed more than seven days without a winner, so late scheduling slips are not just cosmetic. The listed start times differ slightly across feeds, which is a reminder to watch tournament updates rather than relying on one sportsbook board alone. [1][2][13][15]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Jenson Brooksby vs Ben Shelton 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

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

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.

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 PolyGram 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.