National Bank Open: Renata Zarazua vs Tamara Korpatsch

Platform comparison

Market context

Renata Zarazua’s first-round meeting with Tamara Korpatsch in Toronto is the event behind this market, and a **YES** share here means Zarazua advances, while a **NO** share means Korpatsch advances. The listed crowd price of 100% YES implies the market is treating a Zarazua win as effectively certain, but prediction markets can still move sharply if the match is delayed, interrupted, or ruled void under the event’s settlement rules.

On the tennis side, outside pricing and previews are not unanimous. Tennis.com had Zarazua as a 60% projected winner, while other match pages frame Korpatsch as the higher-ranked player, with WTA rankings shown at about 46 for Korpatsch and 83 for Zarazua in recent listings.[1][3] That kind of split is useful for readers new to prediction markets: the market price reflects what traders expect to happen, not an official result, and it can diverge from rankings or model-based previews when courts, form, and matchup style are being weighed differently.[1][3]

The main catalysts are straightforward: whether the match is actually played, whether the start time changes, and whether either player advances by completion, retirement, walkover, or cancellation. Current schedules still list the fixture for 3 August in Toronto, with live-score pages and tournament listings aligned on the same round-one pairing, so the key watchpoints are any official order-of-play updates or match-status changes before the settlement window closes.[5][6][8][9] If the match is not played or is delayed beyond seven days without a winner, the market’s own rules indicate a 50-50 outcome rather than a side being declared.[13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Renata Zarazua vs Tamara Korpatsch 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

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 Prediction Market UK. 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.