Canadian Open: Lorenzo Sonego vs Tallon Griekspoor

Platform comparison

Market context

Lorenzo Sonego and Tallon Griekspoor were due to meet in the Canadian Open, with the market currently pricing the match at **0% YES** on the contract despite the historical matchup pointing the other way. Across tennis data sites, Sonego leads the head-to-head 2-0, and both meetings were on hard courts, including a tight three-set win in Montreal in 2024 and another in Paris in 2022.[2][3][8]

That makes the current prediction-market read notably different from the wider tennis consensus, which generally treats Sonego as the slight favourite in this pairing. Several head-to-head trackers still show Sonego ahead in the series, while one odds-comparison page has Sonego only narrowly preferred, roughly 54.5% to 45.5%, which is far less extreme than the market’s zero-implied price.[5][17] For traders, that gap usually matters most when the event status is uncertain rather than when a live match is already underway.

The main catalysts to watch are simple: whether the ATP draw and scheduling actually place the match on court, whether either player withdraws before start time, and whether rain or tournament backlog pushes play beyond the contract’s seven-day settlement window. Flashscore listed the fixture as live on 3 August 2026, while Sofascore and other live-score pages tied the same pairing to Montreal scheduling, suggesting the contract’s edge case is not tennis quality but execution of the event itself.[2][7] If the match is not played at all, or is delayed too long without a result, the market rules indicate a 50-50 settlement rather than a straightforward win for either side.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Canadian Open: Lorenzo Sonego vs Tallon Griekspoor 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

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

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 Best Prediction Markets UK 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.