National Bank Open: Antonia Ruzic vs Madison Keys

Platform comparison

Market context

Antonia Ruzic’s meeting with Madison Keys in Toronto has been priced as a one-sided favouring of Keys, but the contract’s current **0% YES** crowd-implied probability is materially below the wider market. Kalshi’s live price puts Keys at **82%** and Ruzic at **18%**, which is closely aligned with external model work from Dimers and Stats Insider that also has Keys around the low-80s, while sportsbook-style odds imply an even stronger Keys edge, with TAB around **1.12** and other books listing roughly **-719** to **-752**. That gap suggests the prediction market is discounting the favourite far more aggressively than bookmakers or analytics consensus.[4][2][3][5][6]

The main historical frame is that this is not a new matchup pattern: earlier 2026 previews and results pages repeatedly treated Keys as the clear favourite, with Ruzic generally priced in the **5.0-6.0** range and Keys near **1.14-1.20** in decimal terms.[2][5][7][11] For traders, the key question is not whether Keys starts as favourite, but whether anything disrupts settlement before a winner is recorded. The market rules make that important: a cancellation, tie, or delay beyond seven days would resolve 50-50, so any withdrawal, scheduling change, or weather-related postponement matters as much as on-court form.[4]

The immediate catalysts are straightforward: confirmation that the match is played on schedule, any official withdrawal or walkover news, and the tournament’s updated order of play if the round is reshuffled. Live score and draw-tracking pages already show the pairing in the event flow, which means the market is likely to move only if there is late breaking news on availability or completion rather than on fresh form data.[8][14][16]

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, 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

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'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 Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.