Libema Open: Felix Auger-Aliassime vs Kamil Majchrzak

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Active sub-markets

Market context

The Libema Open grass-court tournament in 's-Hertogenbosch will host a first-round encounter between Canadian Felix Auger-Aliassime and Polish qualifier Kamil Majchrzak on 12 June 2026. Auger-Aliassime, ranked in the top 20, enters as the clear favourite; Majchrzak, a journeyman competitor, has rarely troubled elite players on grass. The 0% implied probability across Polymarket reflects this disparity, though such extreme pricing often signals thin liquidity rather than certainty. On Kalshi, where decimal odds are displayed alongside implied probability, comparable mismatches between seeded and unranked players typically show 1.05–1.15 decimal equivalents. Betfair's exchange format would likely show tighter spreads given higher volume, whilst Smarkets' commission structure (4% on winning bets) can suppress activity in low-probability outcomes.

Historical context matters: Auger-Aliassime has won 73% of grass-court matches since 2023, whilst Majchrzak holds a 31% win rate on the surface across his career. Direct head-to-head records favour Auger-Aliassime decisively. However, grass tournaments produce upsets more frequently than hard courts—approximately 8–12% of seeded-versus-qualifier matches yield surprises—suggesting the true probability sits above zero even if barely.

Traders should monitor Auger-Aliassime's injury status and recent form leading into the tournament, particularly any ATP announcements regarding fitness. Weather conditions at 's-Hertogenbosch—notably wet grass or rain delays—can level playing fields. The settlement window closes 19 June, allowing seven days for completion; matches delayed beyond that trigger a 50-50 resolution, a structural detail that distinguishes this market from Betfair's standard rules.

Methodology

This page compares Libema Open: Felix Auger-Aliassime vs Kamil Majchrzak specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

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). Kalshi Alternative UK routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Is this market available outside the US?

Kalshi Alternative UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 it cost to trade on Kalshi Alternative UK?

Zero. Kalshi Alternative UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.