Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win) 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: Madison Keys vs Xiyu Wang | 100% |
| Completed Match | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Set 2 O/U 8.5 | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Set 1 O/U 8.5 | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Set 2 Winner | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Match O/U 21.5 | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Set 1 Winner | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Set 2 O/U 9.5 | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Set Handicap +/-1.5 | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Set 1 O/U 9.5 | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Match O/U 22.5 | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Set 1 O/U 10.5 | 100% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Total Sets: O/U 2.5 | 0% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Set 2 O/U 10.5 | 0% |
| Cincinnati Open: Madison Keys vs Xiyu Wang Match O/U 23.5 | 0% |
Market context
Madison Keys’ Cincinnati Open meeting with Xiyu Wang is priced as a near-lock, with the market implying a 97% chance of Keys advancing. That sits well above the broader tennis consensus, where pre-match pricing elsewhere has generally put Keys in the low-to-mid 70s to high 70s, so the listed market is already assuming the favourite remains fully fit and the draw plays out normally. Keys also has the stronger Cincinnati profile on hard courts, while Wang has arrived via a walkover and has less depth of form at this level in the event.
The historical frame leans heavily to the favourite: Keys has already beaten Wang once before, and the matchup has not been a regular one on hard court, which makes recent form and conditions more important than head-to-head noise. Keys’ route through the earlier rounds has been straightforward, whereas Wang’s run has included a withdrawal-induced passage, so the main contrarian case is not a clean upset on merit but a disruption to the schedule or a physical issue for either player. On recent numbers, Wang’s Cincinnati breakthrough came only after Elina Svitolina withdrew, underlining how quickly this kind of market can move on non-performance factors.
For traders, the key catalysts are whether the match is actually completed before the settlement window and whether either player is reported as injured, ill, or pulled from the draw. Delays matter here because the market only settles to 50-50 if the match is not played, tied, or pushed beyond the seven-day cutoff without a winner. Any late schedule reshuffle, retirement, or walkover-style development would matter more than a routine form argument, and that is where the small contrarian angle against a 97% price sits.
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 Who Will Win, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.
Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.
UK Frequently Asked Questions
- Where can I trade this market with the lowest fees?
- Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- 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.
- 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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