National Bank Open: Antonia Ruzic vs Madison Keys

Platform comparison

Market context

The match between Antonia Ružić and Madison Keys is priced very differently across venues, with the crowd-implied probability at **0% YES** despite match data and pre-match commentary leaning towards Keys. That split matters because the market contract only resolves on who advances, so even a one-sided pre-match view can be overturned by a retirement, walkover, cancellation or delay, which would push settlement to 50-50 rather than a normal winner outcome.

Historical and comparable evidence points towards Keys as the stronger baseline. She beat Ružić in straight sets at Roland-Garros earlier this season, and the head-to-head now stands at **2-0** in Keys’s favour across listed sources.[1][2][8][17] Keys also carries the higher ranking and a much larger career sample, while Ružić’s appeal is that she has posted a strong run of results over the past 12 months and has already shown she can push into main-draw WTA matches.[11][19] On comparable pricing, Tennis Tonic had Keys around **1.155** pre-match against Ružić at Roland-Garros, versus **5.3** on Ružić, which aligns with a clear favourite but not with a zero-probability market read.[15]

For traders, the key catalysts are straightforward: whether the fixture actually starts on schedule, whether either player withdraws, and whether the draw is altered by rain or scheduling congestion within the seven-day settlement window. Flashscore’s preview notes Keys is seeking a third Canadian Masters third-round appearance and that Ružić lost on her Montreal debut last year, which frames the match as a spot where event familiarity may matter if play goes ahead as planned.[2] If the match is completed, the live risk is mostly one-way towards Keys; if it is not played, the contract’s special settlement rules become the dominant factor.[2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open: Antonia Ruzic vs Madison Keys across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Best Prediction Markets UK, which mirrors the Polymarket order book at 0% fees.

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.

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.