Lexus Eastbourne Open: Janice Tjen vs Caty McNally

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Active sub-markets

Market context

The underlying event is the WTA 250 grass-court tennis match between Janice Tjen and Caty McNally at the Lexus Eastbourne Open in Great Britain, originally set for 5:00 AM ET on 22 June 2026. The prediction market currently shows a 100% implied probability that Janice Tjen will advance, a figure that starkly diverges from typical sportsbook lines where McNally often retains a measurable chance on grass. Historical precedents from previous Eastbourne finals reveal that 100% crowd-implied probabilities in women’s singles are exceptionally rare and usually signal either a withdrawn opponent or a pre-determined outcome, yet no official withdrawal has been announced by the WTA as of 23 June.

Traders should monitor the official WTA tournament schedule and daily draw updates for any confirmation of match completion or cancellation, as grass-court conditions can lead to weather delays that affect resolution timelines. A recent WTA official overview confirms the tournament runs from 22 to 27 June on grass at Devonshire Park, with a 32-player singles draw, meaning any delay beyond seven days would trigger a 50-50 settlement rather than a decisive winner [2]. Analyst consensus remains cautious despite the 100% market probability, noting that McNally’s recent form on grass surfaces suggests she should not be treated as a non-entity, creating a meaningful divergence between prediction-market certainty and expert assessment.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Lexus Eastbourne Open: Janice Tjen vs Caty McNally 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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 does it cost to trade on Best Prediction Markets?

Zero. Best Prediction Markets 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, Best Prediction Markets triggers a quick verification flow that finishes in minutes.