Roehampton: Oliver Tarvet vs Charles Broom

Platform comparison

Market context

Oliver Tarvet faces Charles Broom in a first-round match at Roehampton scheduled for 20 August 2026. The 90% implied probability for Tarvet reflects a significant seeding or ranking disparity between the two players, though the early morning 6:00 AM ET start time introduces scheduling friction that occasionally affects match completion rates on the professional circuit. The settlement window extends to 27 August, allowing a seven-day buffer for rescheduling before the market defaults to 50-50 resolution.

Historical precedent suggests that prediction markets price junior or lower-ranked challengers at 10% or below when facing established players in early-round grass-court fixtures. Roehampton draws a competitive field but lacks the profile of Grand Slam qualifying events, where upsets occur at marginally higher rates. The 90% figure sits within the typical range for such matchups, though cross-platform comparison reveals whether sportsbooks are pricing Tarvet's chances materially differently—a divergence worth monitoring given the illiquidity often present in secondary-tier ATP or ATP Challenger events.

Traders should track official draw confirmations and any late withdrawals from the Roehampton field, as grass-court tournaments occasionally see schedule adjustments due to weather or player injury. Recent tournament reports and player injury bulletins from the ATP website should be consulted through mid-August. The early start time itself warrants attention: matches beginning before 7:00 AM ET sometimes face completion delays if weather deteriorates, potentially triggering the tie-resolution clause. Any announcement regarding either player's fitness status or withdrawal would immediately collapse the current probability structure.

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.