Libema Open: Lois Boisson vs Solana Sierra

Platform comparison

Active sub-markets

Market context

The Libema Open, held annually in 's-Hertogenbosch, Netherlands, will feature a first-round encounter between French qualifier Lois Boisson and Argentine player Solana Sierra on 8 June 2026. The 0% implied probability on this contract reflects either extreme confidence in one player's superiority or minimal trading activity; cross-platform comparison with major sportsbooks would clarify whether this represents genuine consensus or illiquidity. Boisson, ranked outside the top 200 for much of her career, has competed sporadically on the WTA circuit, whilst Sierra, similarly positioned in the rankings, brings comparable tour experience. Historical precedent suggests that matches between players of equivalent ranking and surface aptitude typically settle near 50-50 odds, making the current extreme reading a notable divergence worth monitoring against opening lines from Betfair, DraftKings, or European operators.

The settlement window extends to 15 June, allowing seven days beyond the scheduled date for completion. Key catalysts include official confirmation of both players' participation—withdrawals due to injury or ranking-point prioritisation occur regularly in early-round grass-court events—and any weather disruptions common to Dutch June conditions. The Libema Open's grass surface favours serve-dominant players and those with strong net games; recent form on similar surfaces would be material to reassess the current probability. Traders should monitor WTA entry lists and injury reports through early June, as late withdrawals or walkovers would trigger the 50-50 resolution clause. Any significant movement in sportsbook odds before the match would signal information flow absent from the current prediction-market reading.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Best Prediction Markets, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Best Prediction Markets 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.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Best Prediction Markets triggers a quick verification flow that finishes in minutes.