ITF Roehampton: Charles Broom vs Oliver Tarvet

Platform comparison

Market context

Polymarket has this Roehampton final priced as a near-certain Charles Broom win, with the crowd putting the USDC-settled conditional token at **100% YES** for Broom against Oliver Tarvet. On the Polygon market, that means traders are effectively assuming Broom advances and that the match reaches a normal winner rather than falling into the contract’s 50-50 fallback for a cancellation, tie, or unresolved delay beyond seven days.

That reading is consistent with the wider pricing picture. Kalshi’s comparable Broom v Tarvet market showed Broom as the favourite at 63% in live trading, while other bookmakers and odds aggregators leaned even more heavily towards Tarvet before the result flipped in Broom’s favour; the live tennis feeds now show Broom leading Tarvet 6-3, 6-2, which is exactly the sort of state that would explain why a settlement price has collapsed to certainty on the Broom side.[1][6][15][17]

For traders, the main catalysts are no longer pre-match strength but settlement mechanics: whether the contest is already completed, whether the score is officially recorded, and whether the event goes the distance without an administrative wrinkle. Polymarket’s own rules say a completed match resolves to the player who advances, but a walkover before the start resolves to 50-50, so the key watchpoints are official tour updates, late injury or retirement notices, and any scoring or scheduling changes from Roehampton organisers.[12][2][10]

Sources: 1 · 2 · 3 · 4 · 5

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 Kalshi 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

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.

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%.