Roehampton: Lui Maxted vs Gabi Boitan

Platform comparison

Market context

Lui Maxted and Gabi Boitan are scheduled to meet in a tennis match at Roehampton on 20 August 2026 at 6:00 AM ET. The 100% implied probability on Polymarket reflects either extremely thin liquidity, a data feed issue, or genuine consensus that the match will proceed as scheduled. Kalshi and Betfair typically display decimal odds formats that make such extreme probabilities more visually apparent to traders accustomed to fractional or percentage displays; a 100% reading often signals either a market with minimal depth or settlement certainty. The settlement window extends to 27 August, allowing a seven-day grace period for rescheduling without triggering a 50-50 resolution, a clause that distinguishes this market from some Smarkets offerings which impose tighter deadlines.

Roehampton serves as a qualifying venue for major tournaments, and both players' entry into this fixture depends on their current ranking trajectories and tournament draw confirmation. Recent ATP and WTA qualifying schedules have seen weather-related delays and venue changes; the early morning ET start time (likely reflecting UK morning hours) introduces weather dependency. Traders should monitor official LTA and ATP/WTA communications for any venue changes or draw amendments, particularly in the week preceding 20 August. Maxted's recent form and Boitan's seeding status will influence actual market movement once liquidity increases across platforms.

The extreme probability on Polymarket contrasts sharply with how Kalshi's regulatory framework and Betfair's commission structure typically encourage tighter spreads on lower-probability outcomes. Smarkets' fee model sometimes attracts traders seeking to arbitrage mispriced qualifying-round matches. Until the match begins, the 50-50 resolution clause remains the primary tail risk, particularly if either player withdraws or if scheduling conflicts arise.

Methodology

We read Roehampton: Lui Maxted vs Gabi Boitan 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

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

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. Kalshi Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.