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% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set 1 O/U 8.5 | 100% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set 2 O/U 8.5 | 100% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set 1 O/U 9.5 | 100% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set Handicap +/-1.5 | 100% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set 1 O/U 10.5 | 100% |
| Philadelphia: Simona Waltert vs Fiona Crawley | 0% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set 1 Winner | 0% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set 2 Winner | 0% |
| Philadelphia: Simona Waltert vs Fiona Crawley Total Sets: O/U 2.5 | 0% |
| Philadelphia: Simona Waltert vs Fiona Crawley Match O/U 21.5 | 0% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set Handicap +/-1.5 | 0% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set 2 O/U 9.5 | 0% |
| Philadelphia: Simona Waltert vs Fiona Crawley Match O/U 22.5 | 0% |
| Philadelphia: Simona Waltert vs Fiona Crawley Set 2 O/U 10.5 | 0% |
| Philadelphia: Simona Waltert vs Fiona Crawley Match O/U 23.5 | 0% |
Market context
Philadelphia’s opening-round match between Simona Waltert and Fiona Crawley was scheduled for 24 August at the Philly event, with Waltert entered as the higher-ranked player and Crawley the lower-ranked home wildcard-type profile in the draw listings.[1][2][4] The market’s 0% YES price is consistent with a match that appears to have already been played or progressed on the day, rather than an unresolved pre-match spot.[1][2]
Waltert comes in with the stronger 2026 body of results and a ranking edge, having taken wins on hard courts and reached the second round in Cincinnati shortly before Philadelphia, while Crawley’s recent route has been more mixed but includes a deeper run through lower-tier events and qualifiers.[6][7][13][14] In comparable WTA 125 first-round matches, the favourite’s shorter price usually reflects ranking and level rather than a guarantee, because upset risk remains real on hard courts where short-format sets can swing quickly.[12][15]
What matters now is whether the match has been completed and formally recorded before the settlement deadline, or whether there is any administrative delay, retirement, suspension, or withdrawal that could leave the result unsettled.[1][4] Crawley’s match page and live listings point to an in-play or completed contest on 24 August, while Waltert’s event record and recent form suggest no obvious injury note or coaching disruption is driving the price by itself.[1][5][6] If the result is not officially confirmed in time, the market can still revert to the event’s fallback rules.[4]
Methodology
Sports-specific comparison page for Philadelphia: Simona Waltert vs Fiona Crawley. 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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