Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| Completed Match | 100% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set 2 O/U 8.5 | 100% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set 2 O/U 9.5 | 100% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set Handicap +/-1.5 | 100% |
| National Bank Open: Maria Sakkari vs Coco Gauff | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set 2 Winner | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set 1 Winner | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set 1 O/U 8.5 | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set Handicap +/-1.5 | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Match O/U 21.5 | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Total Sets: O/U 2.5 | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set 1 O/U 9.5 | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Match O/U 22.5 | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set 1 O/U 10.5 | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Match O/U 23.5 | 0% |
| National Bank Open: Maria Sakkari vs Coco Gauff Set 2 O/U 10.5 | 0% |
Market context
The National Bank Open match between **Coco Gauff and Maria Sakkari** is being priced as a heavy Gauff favourite, with the market’s 0% YES implying the crowd sees almost no chance of a Sakkari advance. On form and class, that consensus is understandable: Gauff is the higher-ranked player, leads the overall head-to-head 6-5, and won their most recent meeting in January 2026 on hard court, 6-3 6-2[3][9]. Recent tournament data also points the same way, with Gauff arriving off a stronger 2026 record and a straight-sets win over Sakkari at the National Bank Open itself[5][12].
The historical angle is that this matchup has not been one-way; Sakkari has repeatedly made it awkward, and some databases still show a narrow Sakkari edge in the all-time split because of earlier meetings[10][15]. That matters for handicappers because a 0% crowd price can overstate certainty in a live tennis matchup, especially between players with a prior history of swingy scorelines and hard-court familiarity. The value, if any, is usually on the underdog only if the market is reacting to stale assumptions rather than current fitness or recent match quality[3][5].
The main catalysts are straightforward: whether both players are confirmed in the draw, whether the match is actually staged on schedule, and whether any retirement or weather disruption pushes it into a settlement edge case. Live tournament listings showed the fixture in play around 7 August, while official tournament results recorded Gauff over Sakkari on 7 August 2026[2][7][12]. Traders should watch for order-of-play changes, late withdrawals, and any update to the event schedule, because a no-play or prolonged delay would move the market away from a simple winner-takes-all resolution.
Methodology
This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win, which mirrors the Polymarket order book directly.
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.
UK Frequently Asked Questions
- 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 Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- 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.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
Trade National Bank Open: Maria Sakkari vs Coco Gauff on Who Will Win
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