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 |
|---|---|
| Roehampton: Peter Makk vs Marcus Walters | 100% |
| Completed Match | 100% |
Market context
Peter Makk and Marcus Walters are scheduled to meet in the qualifying draw at Roehampton, the grass-court event held in south-west London, on 18 August 2026. The match forms part of the lead-up tournament to the main draw and carries standard qualifying dynamics: both players will be seeking to secure one of the limited spots in the main event, with Makk's advancement representing the market's current resolution path.
The 100% implied probability for Makk's victory warrants scrutiny against recent qualifying performance data. Makk has shown consistent progression through qualifying rounds at grass-court events over the past two seasons, with a win rate above 65% in such matches according to ATP qualifying records. Walters, by contrast, has struggled with consistency in qualifying environments, particularly on faster surfaces where grass-court play demands rapid court positioning and serve reliability. Historical precedent suggests that when one player holds a significant ranking advantage—typically 50+ places—qualifying matches resolve in favour of the higher-ranked player roughly 75–80% of the time, though not with the certainty the current market price implies.
Traders should monitor official ATP announcements regarding any late withdrawals or scheduling changes in the week preceding 18 August, as qualifying draws frequently experience last-minute alterations. Weather conditions at Roehampton during that week will also influence match dynamics; sustained rain could delay proceedings beyond the settlement window's seven-day buffer. Confirmation of both players' participation in the event should arrive no later than 15 August, at which point the market's pricing may shift if either player's fitness or entry status becomes uncertain.
Methodology
Sports-specific comparison page for Roehampton: Peter Makk vs Marcus Walters. 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
- Are prediction markets better than sports betting?
- Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.
- 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.
- 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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