National Bank Open: Frances Tiafoe vs Marin Cilic

Platform comparison

Market context

Frances Tiafoe’s second-round match with Marin Čilić at the National Bank Open is the real-world event behind this contract, and the market is already pricing it as a near-certain Tiafoe win with a 100% crowd-implied probability. That sits well above the kind of prices typically seen in bookmaker and model-based previews: one betting piece had Tiafoe around -178 and quoted a Kalshi price near 64¢, while another model-driven preview put him at roughly 66.7%, suggesting a meaningful gap between prediction-market sentiment and more conventional tennis pricing. [16][17]

The historical frame is less one-sided than the crowd number implies. Čilić has a 2-0 head-to-head record against Tiafoe, although those meetings came in 2017 and 2018 and were on different stages, so they are only a loose guide to current form. Recent previews still leaned Tiafoe’s way, with Tennis Tonic and The Stats Zone both tipping him to progress, and the ATP-listed match page confirms this is a hard-court meeting in Montréal, where surface-specific form matters more than the old head-to-head. [9][13][12][2]

For traders, the key catalysts are straightforward: the match is listed as a round-two fixture originally scheduled for 4 August at 7:00 pm ET, and live scoreboards show it has already moved into play, with the result state therefore dependent on completion rather than mere scheduling. That matters because this contract resolves to 50-50 if the match is cancelled, tied, or delayed beyond seven days without a winner, so any weather interruption, suspension, or late withdrawal becomes relevant to settlement rather than pure tennis odds. [3][6][1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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.

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.

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 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.