Cincinnati Open: Juan Manuel Cerundolo vs Felix Auger-Aliassime

Platform comparison

Market context

Juan Manuel Cerúndolo and Félix Auger-Aliassime were listed for a Cincinnati Open third-round match at Grandstand, with multiple schedules placing it on 18 August and some carrying it into 19 August because of local time conversion and weather-related slippage[1][6][12]. In market terms, a 0% YES price usually means the event is either already out of date, already effectively decided elsewhere, or the underlying data feed has not caught up; programmatically, that is the first thing to verify before doing anything else. For a power-user workflow, the sensible check is whether the match state is still “upcoming”, “live”, or “completed” across several sources, then whether a walkover, retirement, or postponement has changed the settlement path.

The comparison set for reading this market is straightforward: Cincinnati has already seen repeated weather disruption in 2026, including cancelled and delayed sessions on 11 and 12 August, plus later suspensions that left parts of the schedule in limbo[9][14][15]. That matters because tennis markets can flip from a straightforward winner-take-all contract to a 50-50 outcome if a match is not played at all, is tied, or is pushed beyond the seven-day settlement trigger. Traders using bots or conditional orders would normally key off official order-of-play updates, live score APIs, and tournament status pages, because those are the dependencies that decide whether a match is simply delayed, abandoned, or resolved by result.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Cincinnati Open: Juan Manuel Cerundolo vs Felix Auger-Aliassime across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.