National Bank Open: Tatjana Maria vs Caty McNally

Platform comparison

Market context

Polymarket is pricing Tatjana Maria at **79%** against Caty McNally, with the contract settling via conditional tokens on Polygon and paying out in USDC according to who advances. That level implies the market sees Maria as the clear favourite, but not an overwhelming one, and it is still sensitive to match status because a cancellation, a tie, or a delay beyond seven days would force a 50-50 result under the contract rules.

The historical frame is mixed rather than one-way. McNally led their only completed head-to-head, beating Maria in three sets at Newport in July 2025, while the broader profile is close on recent hard-court numbers: Tennis.com lists Maria at world No. 79 in singles and McNally at No. 73, with McNally also carrying a stronger doubles ranking and a more recent run of results in some datasets[1][13][15]. That helps explain why the market is pricing Maria well above a coin flip but still leaving room for upset risk, especially on a hard court where neither player has a decisive ranking edge.

For traders, the main catalysts are straightforward: confirmation that the first-round match is played on schedule, any late order-of-play changes, and any withdrawal, walkover, or suspension news from the National Bank Open draw. Sportschau and Tennis.com both list the match as a first-round Toronto fixture dated 3 August 2026, so the key question for settlement is whether it is actually completed within the seven-day window, not just whether it appears on the schedule[1][3]. If play starts but does not finish, the contract language makes the advancing player the winner; if it never starts, the resolution can revert to the 50-50 fallback.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Tatjana Maria vs Caty McNally 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

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.

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.