National Bank Open: Antonia Ruzic vs Madison Keys

Platform comparison

Market context

Polymarket has this contract at **0% YES** right now, even though the underlying match between Antonia Ružić and Madison Keys is live or recently live in Toronto. On Polymarket, the position is a USDC-denominated conditional token on Polygon, so traders are pricing the chance that Ružić ultimately advances rather than simply whether the match was scheduled or started.

The closest read-through is the prior pricing and form gap between the players. Pre-match and model-based previews consistently made Keys the clear favourite, with outside estimates around 78% for Keys and roughly 22% for Ružić, and earlier comparable meetings also had Keys strongly favoured. That kind of baseline makes a 0% YES print easier to understand if the market believes Keys has already advanced, or if settlement mechanics are pointing away from a Ružić win rather than towards a live upset. Similar one-sided tennis contracts often stay pinned near zero until an official result change, because conditional-token markets move on verified match progression, not on in-play momentum.

For a trader, the key catalysts are the official scoreline, whether the match completes, and any tournament or feed confirmation of advancement. Live listings from Yahoo Sports and tennis sites show the contest underway in the second set, while prediction desks and odds boards still treat Keys as the firm favourite, with one recent preview calling Keys to win in straight sets and another listing Keys around -481 on the moneyline[2][3][20]. The practical issue is whether any delay, suspension or retirement triggers the market’s special settlement rules: if the match is not played at all, ends tied, or slips beyond seven days without a winner, the contract resolves 50-50 instead.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Antonia Ruzic vs Madison Keys 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.