National Bank Open: Antonia Ruzic vs Madison Keys

Platform comparison

Market context

Polymarket is pricing the match between Antonia Ružić and Madison Keys at **0% YES**, which is far below the broader tennis market view and leaves the contract effectively pinned to an extreme longshot on-chain price in USDC on Polygon. The settlement mechanics still matter more than the headline number: if the match is not played, ends tied, or is pushed beyond the seven-day window without a winner, the market resolves 50-50 rather than to either player.

That kind of pricing normally sits in the shadow of a strong favourite, and the comparable baseline here is clear: outside prediction markets, recent models have had Keys around the low-80s to high-80s percentage range, with moneyline prices reflecting a heavy favourite and Ružić priced as a significant underdog.[1][2][5] The earlier clay-court meeting between the pair also resolved in Keys’ favour, which is the sort of prior result traders often use to sanity-check whether a near-zero market is reflecting genuine confidence or simply thin liquidity and a hard-to-move book.[4][17]

For traders, the practical catalysts are straightforward: confirm the official National Bank Open schedule, watch for any order-of-play changes, and check for retirements, walkovers, or rain-related delays that could keep the market open without a normal finish. The key event-risk is not just who wins, but whether the match starts and concludes inside the settlement rules; a delayed or abandoned match can push the contract into the 50-50 bucket even if one player looked dominant before play stopped.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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.

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.