ITF Roehampton: Charles Broom vs Oliver Tarvet

Platform comparison

Market context

Polymarket is pricing **Charles Broom** at 100% YES, which means the contract is effectively treating his advance as a near-certainty in USDC terms on Polygon. For a trader, that leaves almost no upside left in the conditional token, so the key issue is not the match abstractly but whether the event settles normally, gets walked over, or is pushed into the market’s 50-50 fallback rules.

That pricing also needs to be read against the event format and the way comparable Roehampton markets have resolved. Broom is listed around ATP 287, while Tarvet is around ATP 436 in live tennis feeds, and third-party odds sources show Broom as a favourite, but not at anywhere near a 100% implied chance[7][12][14][15]. In other words, a 100% market price is far tighter than the wider tennis ecosystem, which usually leaves some room for a routine upset, especially in ITF men’s events where surface form and short-format volatility matter. Past Roehampton markets have also shown that settlement mechanics can matter as much as on-court strength: if a match never starts, or is walked over before a ball is played, Polymarket’s rules can push the contract to 50-50 rather than a player win[11].

The main catalysts are therefore scheduling and officiating, not just performance. Live tennis listings currently place Broom v Tarvet in the Roehampton final slot, with some feeds showing a 05:30 start and others indicating a later local time, so traders should watch for final order-of-play confirmation, court allocation, and any delay notices[10][12][14]. The market description says a result must be determined by 2026-08-16T09:30:00Z, which matters because a delay beyond seven days from the scheduled date triggers the tie-style fallback. If the match starts, retirement or disqualification after play begins should still resolve to the player who advances under Polymarket’s contract terms[11].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track ITF Roehampton: Charles Broom vs Oliver Tarvet 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

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%.