Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) 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: Maya Joint vs Liudmila Samsonova Set 2 Winner | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Total Sets: O/U 2.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Set 1 O/U 8.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Set 2 O/U 8.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Match O/U 21.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Set 1 O/U 9.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Set 2 O/U 9.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Match O/U 22.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Set 1 O/U 10.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Set 2 O/U 10.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Match O/U 23.5 | 100% |
| National Bank Open: Maya Joint vs Liudmila Samsonova | 0% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Set 1 Winner | 0% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Set Handicap +/-1.5 | 0% |
| National Bank Open: Maya Joint vs Liudmila Samsonova Set Handicap +/-1.5 | 0% |
Market context
Maya Joint and Liudmila Samsonova are due to meet in Toronto’s National Bank Open third round, with the match already under way or imminently scheduled on Grandstand. The market’s 0% crowd-implied YES price is hard to square with the live match context: both players have already advanced through two rounds, and the event page lists the tie as an active Round 3 fixture on 7 August.[1][6][8]
The best historical frame is Samsonova’s edge in the only prior meeting. She beat Joint in straight sets at Wimbledon in 2025, and several preview feeds note that this is their first hard-court meeting.[2][3][7] That favours reading the current price as a likely underestimate of Samsonova’s chances if the market has not fully updated for the draw state. It also matters that Samsonova has deeper Toronto pedigree, having gone further there in earlier editions, while Joint’s Toronto run is being described as a resurgence after a difficult season.[3][10]
For traders, the main catalysts are whether the match has actually started, whether play is suspended, and whether either player’s path changes through retirement, walkover or scheduling delay. Current listings show the contest as an upcoming or live women’s singles match, but with some outlets giving slightly different start times, so official tournament status is the cleanest dependency to watch.[1][5][11][13] Recent previews also point to form, rest and opponent quality as the key variables: Joint arrived after a strong run in Toronto, while Samsonova’s week was framed by solid straight-set wins over tougher names.[2][3][10]
Methodology
Sports-specific comparison page for National Bank Open: Maya Joint vs Liudmila Samsonova. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.
Resolution & payout
Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.
UK Frequently Asked Questions
- When do sports markets resolve?
- Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.
- What are live sports odds on Polymarket?
- Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.
- 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%.
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