National Bank Open: Lucrezia Stefanini vs Camila Osorio

Platform comparison

Market context

Polymarket is pricing this Toronto first-round contract at **0% YES** right now, which implies the market is treating Lucrezia Stefanini’s chance of advancing over Camila Osorio as effectively nil on a USDC-settled, Polygon-based conditional token. The contract only resolves to Stefanini if she advances, while a cancellation, tie, or a delay beyond seven days would push settlement to 50-50, so the relevant question is not just who is favoured but whether the match is actually completed within the resolution rules.

The historical frame is one of a clear ranking and form gap. Osorio is listed around **WTA No. 56** versus Stefanini at **No. 144**, and the National Bank Open page shows the match as a first-round tie on outdoor hard courts in Toronto.[1][2][4] Supporting form data also points towards Osorio: Flashscore notes she has won 11 of 13 matches this season against players outside the top 100, while Stefanini has not recorded a tour-level win in 2026 and has only one main-draw WTA 1000 win, against an unranked opponent in Rome in 2024.[3]

For traders, the practical catalysts are straightforward: official tournament scheduling, any late court or weather changes, and whether the match starts and finishes inside the seven-day settlement window.[2] The most useful live signals are the tournament results page, which tracks whether the match is still at 0-0 or has progressed, and any draw or order-of-play updates from the event, since a start without completion changes the resolution logic if the match cannot be resumed and decided in time.[1][2]

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 PolyGram, 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.

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.

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.