National Bank Open: Maria Sakkari vs Coco Gauff

Platform comparison

Market context

Polymarket has this contract priced at **0% YES** for Maria Sakkari, which means the market is effectively saying Coco Gauff is the only credible winner under the current set-up. On Polymarket, traders post USDC on Polygon and the contract resolves via conditional tokens, so the price reflects both the tennis read and the market’s view of settlement risk, including the 50-50 fallback if the match is not completed or is delayed beyond the stated window.

That near-zero print is far more extreme than the broader betting and preview market. TennisTemple lists Coco Gauff around **1.25** in average bookmaker odds versus Sakkari around **3.98**, which implies a strong favourite rather than a shutout[1]. Other preview and sportsbook pages also heavily lean Gauff, with price ranges roughly equivalent to a low-20s to high-20s per cent chance for Sakkari, not zero[3][10][20]. For Polymarket users, that gap matters: a 0% YES quote can persist when liquidity is thin or when the market is assuming the most likely match outcome while largely ignoring tail settlement scenarios.

The main catalysts are straightforward: whether the match is actually played, whether the scheduled court time changes, and whether there is any withdrawal, cancellation or weather interruption that pushes the market into its 50-50 rule set. National Bank Open schedules and results pages are the cleanest operational checks, while match preview boards and live odds feeds can show if Gauff remains the firm favourite or if the pricing shifts after a start-time update[13][15][16]. A published preview from Tennis Tonic also had Gauff as the expected winner, which matches the wider market bias but does not remove the binary risk that a late cancellation or walkover would override the tennis result entirely[4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews National Bank Open: Maria Sakkari vs Coco Gauff 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

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.

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.