US Open, Qualification ATP: Pol Martin Tiffon vs Tom Gentzsch

Platform comparison

Market context

Polymarket has this contract at 0% YES, which means the market is effectively pricing no confirmed advance for Pol Martin Tiffon against Tom Gentzsch at present. The underlying event is a US Open qualifying match on outdoor hard courts in New York, and the contract settles on who advances, with a 50-50 fallback if the match is not completed in time or is voided by the market rules.

The most relevant comparison is that both players sit in the lower-to-mid ATP ranking band, with Gentzsch listed ahead of Tiffon in recent match coverage, which helps explain why a near-zero price can persist if the market sees one side as already favoured or the result as effectively resolved off-platform. In prediction markets, a 0% print can also reflect stale liquidity rather than a firm view, so the live question is whether the match has already been decided, postponed, or left short of a final determination under the settlement window.

For a Polymarket user, the key catalysts are simple and mechanical: any official score update, retirement, walkover, abandonment, or schedule reshuffle before the 7 September deadline can change how the conditional tokens resolve. US Open qualifying was scheduled across 24–27 August, with singles qualifying matches starting on outside courts in New York and broadcast coverage running through ESPN channels and streaming; that makes order-of-play changes, court assignments, and last-minute withdrawals the main facts to watch.

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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 PolyGram. 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%.