Libema Open: Lois Boisson vs Solana Sierra

Platform comparison

Active sub-markets

Market context

The Libema Open grass-court tournament in 's-Hertogenbosch will host a first-round match between French qualifier Lois Boisson and Argentine player Solana Sierra on 8 June 2026. Polymarket's conditional token contract currently reflects zero probability for Boisson advancing, pricing the match outcome entirely toward Sierra on USDC collateral via Polygon. This extreme skew suggests either substantial pre-match information favouring Sierra or minimal liquidity depth in the order book at present.

Boisson, ranked outside the top 200 historically, has competed primarily on ITF and lower-tier WTA circuits; Sierra similarly operates in the secondary professional ranks. Comparable first-round matchups between players of this calibre at established ATP 250 events show volatile outcomes, with seeding and recent form carrying disproportionate weight. The 0% probability assigned to Boisson reflects either a significant ranking or recent performance gap, or represents an artefact of thin trading volume where even modest Sierra backing moves the contract sharply.

Traders should monitor official Libema Open draw confirmation and any late withdrawals through the tournament's published schedule. Grass-court conditions at 's-Hertogenbosch favour certain playing styles; recent performance on similar surfaces (Eastbourne, Bad Homburg qualifying rounds) will signal form entering the event. The settlement window closes 15 June 2026, allowing seven days beyond the scheduled date for completion. Any match delay beyond that threshold or unfinished contest triggers the 50-50 resolution clause, creating tail-risk exposure for positions held through the final days.

Methodology

We track Libema Open: Lois Boisson vs Solana Sierra on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Polymarket Scam? 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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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 Polymarket Scam??

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Scam? triggers a quick verification flow that finishes in minutes.