Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Market UK) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | See live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | See live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | See live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | See live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| Cincinnati Open: Caty McNally vs McCartney Kessler Set 1 O/U 8.5 | 100% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Set 1 Winner | 100% |
| Cincinnati Open: Caty McNally vs McCartney Kessler | 79% |
| Completed Match | 50% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Total Sets: O/U 2.5 | 50% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Set 2 Winner | 50% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Set Handicap +/-1.5 | 50% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Set 2 O/U 8.5 | 50% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Set 2 O/U 9.5 | 50% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Match O/U 23.5 | 50% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Set 2 O/U 10.5 | 50% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Match O/U 21.5 | 48% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Match O/U 22.5 | 40% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Set 1 O/U 9.5 | 0% |
| Cincinnati Open: Caty McNally vs McCartney Kessler Set 1 O/U 10.5 | 0% |
Market context
The Cincinnati Open, held annually at the Western & Southern Open in Ohio, is one of the WTA Tour's most prestigious hard-court events. This market settles based on whether American player Caty McNally defeats fellow American McCartney Kessler in their first-round match, originally scheduled for 13 August 2026. A YES share gains value if McNally advances; a NO share gains value if Kessler wins. The current 79% implied probability favours McNally, reflecting market confidence in her progression past Kessler in this single-elimination format.
McNally, ranked consistently within the top 100 on the WTA Tour, has competed regularly at Cincinnati and holds a mixed record against lower-ranked opponents in early rounds. Kessler, also American, has competed on the professional circuit but typically occupies a lower ranking. Historical patterns at Cincinnati show that seeding and recent form matter substantially; unseeded or lower-seeded players do advance, though the favourite's advantage in a single match remains statistically significant. The 79% probability reflects standard expectations for a player of McNally's ranking facing Kessler, though upsets occur in roughly one in five matches at this level.
Traders should monitor official WTA scheduling confirmations as the tournament date approaches, particularly any weather delays or venue changes that could push the match beyond the 7-day window triggering a 50-50 resolution. Injury announcements or withdrawals from either player would also affect settlement. Recent form in the weeks preceding Cincinnati—results from other hard-court events in summer 2026—will provide updated context on both players' condition and confidence heading into the match.
Methodology
This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Market UK, which mirrors the Polymarket order book directly.
Resolution & payout
Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.
Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.
UK Frequently Asked Questions
- Is this market available outside the US?
- Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.
- What does Polymarket cost to trade?
- Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.
- 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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