National Bank Open: Antonia Ruzic vs Madison Keys

Platform comparison

Market context

Madison Keys remains the clear market leader, and the last 24–48 hours have not produced any visible reversal in that shape. External model prices are still clustered around an easy Keys win, with one live tennis model putting Keys at roughly 83% and Ruzic around 17%, which is much stronger than the market’s 5% YES reading on Ruzic[1][2][3].

That gap is best read against the pair’s recent head-to-head and the wider pricing pattern around their earlier meetings. Public match previews from the French Open also had Keys as a substantial favourite, generally in the low-80s to high-80s range, and the historical record shows Keys has already beaten Ruzic twice, including straight-sets wins in May 2026[1][3][4][16][17]. In practical terms, a 5% Ruzic price implies an upset expectation well below what recent model and betting estimates have suggested in comparable spots[1][2][12].

For traders, the key catalyst is simple: whether the scheduled National Bank Open match goes ahead as planned and which line-up the tournament confirms close to first ball. Monitor official order-of-play updates, any retirement or withdrawal news, and whether the contest is completed within the settlement window, because a no-contest, tie, or a delay beyond seven days would trigger the 50-50 outcome under market rules[8][15]. If the match starts but is later interrupted, the advance decision rather than the scoreline will determine settlement, so pre-match availability and on-site conditions matter more than in a standard completed-match market[8][15].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.

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

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 Prediction Today. 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.

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.