National Bank Open: Lucrezia Stefanini vs Camila Osorio

Platform comparison

Market context

Camila Osorio’s first-round meeting with Lucrezia Stefanini in Toronto has been priced very differently across the market stack: the prediction market sits at **0% YES** for Stefanini, while sportsbook and analyst-style previews generally make Osorio the clear favourite. Flashscore describes Osorio as a “strong favourite for a straight-set win”, and Tennis.com lists the WTA rankings gap at 56 for Osorio and 144 for Stefanini, which is the sort of spread that usually pushes public prices away from an upset.[3][4]

The historical frame also leans towards Osorio. The pair have **no recorded head-to-head**, so traders have to lean on broader level rather than matchup-specific history, and the comparable numbers are one-sided: Osorio has won 11 of 13 matches against outside the top 100 this season, while Stefanini has not posted a tour-level win in 2026 so far, according to Flashscore.[2][3] Even so, a 0% contract price is more extreme than the underlying tennis profile alone would justify, because first-round WTA 1000 matches can swing quickly if the favourite starts slowly or if the event draw opens up unexpectedly.[2][3]

The main catalysts are straightforward: whether the match actually begins, whether it is pushed back within the market’s seven-day window, and whether a default, retirement or weather-related delay changes settlement to 50-50 rather than a straight win. The National Bank Open schedule pages list the match for Toronto on 2 August, but the live status pages should be watched closely for a late court assignment, revised start time, or a pre-match withdrawal.[1][4][6] If the match is played, the live sportsbook line and any in-play movement will matter more than the static pre-match price, because the current contract is already anchored at the floor.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open: Lucrezia Stefanini vs Camila Osorio 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

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 Best Prediction Markets 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.

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