Pronóstico: National Bank Open: Frances Tiafoe vs Marin Cilic

Platform comparison

Market context

Polymarket is pricing **Frances Tiafoe** at 100% YES on this contract today, but the market still settles on the actual match outcome under its conditional-token rules on Polygon and in USDC. The event is the National Bank Open meeting between Tiafoe and Marin Cilic, originally scheduled for 4 August at 7:00pm ET, with a 50-50 fallback only if the match is not played, ends tied, or is delayed beyond seven days without a winner. [16][1]

That near-certain crowd price is far above the wider pre-match tape, where several tennis previews had Tiafoe as a clear favourite but still only around the low-to-mid 60s in implied win probability, with prices such as 59% on Kalshi and roughly 61% in a model-based projection. [16][18] Comparable H2H and odds pages also pointed to Tiafoe as the likelier winner, but not an automatic one: Cilic’s experience and serve make this the sort of best-of-three matchup where a slow start or a tight set can quickly move a live price, especially if the market is still open before the first ball. [10][14][15]

For traders, the key catalysts are practical rather than speculative: the official start time, any late schedule change from the tournament, and whether the match actually begins, because that determines whether the contract resolves to a player or reverts to 50-50 under the stated rules. [16] If the draw is rearranged or the fixture is postponed outside the seven-day settlement window, the on-chain payoff logic matters more than the tennis narrative, since Polymarket’s conditional tokens pay out only after the match state is known and recorded in the settlement process.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: National Bank Open: Frances Tiafoe vs Marin Cilic 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

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

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.

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.

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.