ITF Roehampton: Charles Broom vs Oliver Tarvet

Platform comparison

Market context

Charles Broom and Oliver Tarvet were due to meet in the ITF M25 Roehampton men’s event on 9 August, with live tennis feeds listing the match as scheduled for 09:30 UTC. The market’s crowd-implied 100% Yes sits alongside exchange-style pricing that is effectively saying the same thing in different language: Robinhood’s market shows Broom around 89¢ and Tarvet 11¢, while the same event on conventional books is framed as decimal odds rather than a binary contract price.[2][11][13]

For context, this is not a mismatch between two unknowns. TennisStats shows the pair have an even head-to-head record, while ATP snapshots in live coverage place Broom higher in the rankings than Tarvet, which helps explain why the market is heavily one-sided but not immune to event-risk in a lower-tier ITF final.[1][3][4] On Betfair, Smarkets, or Kalshi-style contracts, the practical read is different: betting exchanges quote back/lay prices and factor in commission, while prediction markets quote a direct probability-like price and may add platform-specific settlement rules and access limits, including KYC and jurisdiction filters.

The main catalysts now are straightforward: whether the final starts on time, whether the players are officially confirmed on court, and whether any court change, withdrawal or weather delay alters the status before completion. Polymarket’s own rule set is stricter than a simple “match played” view because any retirement, walkover or incomplete match resolves No, whereas some other venues can settle around a player advance or use separate retirement rules; that difference matters most in ITF events, where late withdrawals are more common than on the main tour.[7][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read ITF Roehampton: Charles Broom vs Oliver Tarvet from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.