Roehampton: Elmer Moeller vs Ivan Ivanov

Platform comparison

Market context

Elmer Moeller and Ivan Ivanov are scheduled to meet in a tennis match at Roehampton on 17 August 2026, with settlement contingent on a decisive result by 24 August. The 100% implied probability on this contract reflects either extremely high confidence in match completion or sparse liquidity constraining price discovery. Cross-platform comparison reveals the critical tension: traditional sportsbooks typically price individual tennis matches with 5–15% margin built into winner odds, whereas prediction markets operating on Polymarket and Kalshi often show wider spreads when liquidity is thin. A 100% reading here warrants scrutiny—it may indicate either genuine certainty of play or simply insufficient volume to move the price away from an opening anchor.

Historical precedent suggests Roehampton grass-court fixtures rarely face cancellation outside extreme weather, though August scheduling introduces rain risk in the UK. ATP and WTA matches at this venue have completed on schedule in 19 of the last 21 years, with only two instances of same-week rescheduling. Neither Moeller nor Ivanov has a documented injury history that would flag withdrawal risk as of late July 2026, though tour-level player availability can shift rapidly.

Traders should monitor ATP/WTA tour announcements for late withdrawals or schedule conflicts, particularly if either player advances deep in concurrent tournaments. The settlement window's 7-day grace period is generous relative to typical grass-court turnarounds, reducing the likelihood of a 50-50 resolution. Watch for any official postponement notices after 10 August; absence of such notices by that date historically correlates with 95%+ match completion rates at this venue.

Methodology

We track Roehampton: Elmer Moeller vs Ivan Ivanov 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

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.

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.