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: Michael Geerts vs Billy Blaydes | 100% |
| Completed Match | 100% |
| Roehampton: Michael Geerts vs Billy Blaydes Set 2 Winner | 100% |
| Roehampton: Michael Geerts vs Billy Blaydes Set 1 Winner | 100% |
| Roehampton: Michael Geerts vs Billy Blaydes Set 2 O/U 8.5 | 100% |
| Roehampton: Michael Geerts vs Billy Blaydes Set 1 O/U 8.5 | 100% |
| Roehampton: Michael Geerts vs Billy Blaydes Match O/U 21.5 | 100% |
| Roehampton: Michael Geerts vs Billy Blaydes Set Handicap +/-1.5 | 100% |
| Roehampton: Michael Geerts vs Billy Blaydes Set 2 O/U 9.5 | 100% |
| Roehampton: Michael Geerts vs Billy Blaydes Set 2 O/U 10.5 | 100% |
| Roehampton: Michael Geerts vs Billy Blaydes Total Sets: O/U 2.5 | 0% |
| Roehampton: Michael Geerts vs Billy Blaydes Match O/U 22.5 | 0% |
| Roehampton: Michael Geerts vs Billy Blaydes Set 1 O/U 9.5 | 0% |
| Roehampton: Michael Geerts vs Billy Blaydes Match O/U 23.5 | 0% |
| Roehampton: Michael Geerts vs Billy Blaydes Set 1 O/U 10.5 | 0% |
| Roehampton: Michael Geerts vs Billy Blaydes Set Handicap +/-1.5 | 0% |
Market context
Michael Geerts and Billy Blaydes are scheduled to meet in a tennis match at Roehampton on 18 August 2026, with the settlement window closing on 25 August. The 100% implied probability suggests either exceptionally strong conviction in one player's advancement or minimal uncertainty about the match proceeding as scheduled.
Historical precedent for matches at Roehampton shows high completion rates during the summer grass-court season, with cancellations or extended delays rare outside of severe weather events. The venue's indoor facilities and established tournament infrastructure reduce the likelihood of the match being postponed beyond the seven-day threshold that would trigger a 50-50 resolution. Previous Roehampton fixtures have typically resolved within 24 hours of their scheduled start, establishing a baseline for how traders should weight scheduling risk against player performance variables.
Traders should monitor several catalysts through late August. Player injury reports and withdrawal announcements in the week preceding the match carry outsized weight given the settlement window's proximity to the event date. Roehampton's official draw updates and any weather forecasts for mid-August will clarify fixture stability. Recent form data for both players—including results from warm-up tournaments and grass-court preparation events in early August—will provide concrete evidence for reassessing the current probability, particularly if either player shows unexpected vulnerability or strength on the surface. Tournament scheduling changes, whilst uncommon at established venues, should be tracked through the ATP and WTA official channels.
Methodology
Sports-specific comparison page for Roehampton: Michael Geerts vs Billy Blaydes. 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.
- Can I bet on individual matches?
- Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.
- 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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