National Bank Open: Frances Tiafoe vs Marin Cilic

Platform comparison

Market context

Frances Tiafoe and Marin Čilić were due to meet at the National Bank Open on 4 August, and the market’s 33% implied chance for Tiafoe is lower than a straight coin flip because the most recent comparable profile still favours Čilić on head-to-head history. Their recorded meetings are 2-0 to Čilić, with wins on hard and clay, and both were in straight-forward best-of-three formats rather than marathon matches.[1][6] That matters because the market settles on who advances, not on set score, so a tight contest still resolves cleanly to one side.

The historical framing is mixed, though, because the results are old enough that they mainly describe the matchup shape rather than current form. Tiafoe has been the higher-ranked player in the available pre-match listings, while Čilić’s age and lower ranking suggest a different baseline than in 2017-18.[4][12][15] Recent 2026 season stat snapshots also show Tiafoe with the stronger broader season record, while Čilić has posted the bigger serve numbers, including more aces per match and a higher first-serve points won rate in the available comparison.[3]

For today’s outlook, the key catalysts are the official match status, any start-time change, and whether the contest actually begins and finishes within the settlement window. Live match pages already list the fixture, but if it is postponed, cancelled, or pushed beyond seven days from the scheduled date without a winner, the market resolves 50-50 under the stated rules.[10][15] If the match starts but is not completed, the advance decision becomes the decisive event for settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open: Frances Tiafoe vs Marin Cilic 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 Prediction Today, which mirrors the Polymarket order book at 0% fees.

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

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.

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 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 Prediction Today 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.