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 |
|---|---|
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima | 100% |
| Completed Match | 100% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Set 2 Winner | 100% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Set 1 Winner | 100% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Set 1 O/U 8.5 | 100% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Total Sets: O/U 2.5 | 0% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Set 2 O/U 8.5 | 0% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Match O/U 21.5 | 0% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Set Handicap +/-1.5 | 0% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Set 2 O/U 9.5 | 0% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Match O/U 22.5 | 0% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Set 1 O/U 9.5 | 0% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Set 2 O/U 10.5 | 0% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Set 1 O/U 10.5 | 0% |
| Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima Match O/U 23.5 | 0% |
Market context
Harriet Dart faces Moyuka Uchijima in the opening round of Cincinnati Open qualifying on 11 August 2026. The British player, ranked in the 150s, competes regularly on the WTA circuit and has accumulated significant match experience across hard-court tournaments. Uchijima, a Japanese qualifier, operates at a lower ranking and has limited exposure at this tier of competition. The 100% implied probability reflects Dart's ranking advantage and established tour presence.
Historical qualifying matchups at Cincinnati between players of substantially different ranking tiers typically favour the higher-ranked competitor at rates exceeding 75%, though upsets occur when the lower-ranked player enters with recent momentum or specialised hard-court form. Dart's consistent participation in WTA events suggests baseline fitness and match readiness, whilst Uchijima's path to qualifying indicates she is competing outside her typical tournament level. The settlement window extends to 18 August, allowing seven days for completion—sufficient time for standard scheduling unless weather or injury intervenes.
Traders should monitor official Cincinnati draw confirmations and any late withdrawals from either player in the days preceding the match. Hard-court conditions at the Western & Southern Open typically favour aggressive baseline play; Dart's tactical profile and court familiarity give her structural advantage. Injury reports or coaching adjustments announced closer to the scheduled date could shift match dynamics, though current data points to Dart as the clear favourite. The match's position in the qualifying draw and any scheduling conflicts with other tournaments will determine whether play occurs on the advertised date.
Methodology
Sports-specific comparison page for Cincinnati Open, Qualification: Harriet Dart vs Moyuka Uchijima. 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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