Libema Open: Caty McNally 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 American Caty McNally and Colombian Solana Sierra on 11 June 2026. Polymarket currently prices this contract at 50-50 USDC on Polygon, reflecting genuine uncertainty about the outcome. The settlement window closes 18 June, allowing a week for the match to conclude; any cancellation, tie, or unfinished contest beyond that deadline triggers a 50-50 resolution, effectively splitting the conditional token pool.

McNally has competed consistently on the WTA circuit with career highs in singles ranking around 55th, whilst Sierra remains a lower-ranked player on the professional tour. Historical grass-court form matters considerably here—McNally has shown competence on faster surfaces, though neither player commands a dominant record on grass specifically. The 50-50 pricing suggests the market views this as a genuine toss-up, possibly reflecting limited recent head-to-head data or comparable matchup history between these two competitors.

Traders should monitor the official Libema Open draw confirmation and any injury announcements in the days preceding 11 June. Weather disruptions at Dutch grass courts can cause scheduling delays; the settlement terms allow seven days beyond the original date before triggering the tie resolution. Recent WTA rankings updates and any late withdrawals from the tournament would shift the conditional token valuations, as would confirmation of either player's grass-court preparation matches beforehand.

Methodology

We track Libema Open: Caty McNally 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

Where can I trade this market with the lowest fees?

On Polymarket Scam?, 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.

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 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.

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, Polymarket Scam? triggers a quick verification flow that finishes in minutes.