ITF Roehampton: Charles Broom vs Oliver Tarvet

Platform comparison

Market context

Charles Broom and Oliver Tarvet met in an ITF M25 Roehampton grass-court match, and the market is effectively already pricing the result as settled rather than uncertain. Live and results pages show Broom was the stronger-ranked player, sitting around ATP 287 versus Tarvet’s 436, with pre-match moneyline pricing around 1.33 for Broom and 2.84 for Tarvet; current market odds had also compressed sharply towards Broom before the finish, which is what you would expect when a favourite is either leading or has already completed the job.[3][10][13]

For a power-user running this programmatically, the key historical read is that there was no head-to-head baseline to anchor on, so the cleanest inputs are rank gap, surface, and live match state rather than prior meetings.[1] Grass-season ITF men’s events also tend to produce tighter distribution than the rankings alone suggest, but Roehampton data around this match pointed to Broom’s better recent match win rate and stronger tour-level profile.[1][8][10] In practice, that means any conditional-order logic should treat a 100% YES price as a post-resolution state unless the feed is stale or the result has not yet been officially locked in.[17]

The main catalysts to watch are the official scoreline, whether the match was completed on the day, and any schedule disruption that could trigger the market’s cancellation or seven-day-delay clause.[17] Tennis result feeds already showed a completed Broom win, so the remaining task is verification across the event source and any secondary live-score provider, which is the usual pattern for bot-based reconciliation workflows.[9][11] If the match had been abandoned mid-way, the settlement would depend on whether a winner was ultimately advanced or whether the event slipped beyond the seven-day window, so automated traders would typically poll both match status and tournament draw updates before finalising exposure.[17]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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%.