Ilkley: Mary Stoiana vs Celine Naef

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Active sub-markets

Market context

The Ilkley grass-court tournament will host a women's singles match between Romanian player Mary Stoiana and Swiss competitor Celine Naef on 13 June 2026. The market resolves YES if Stoiana advances, NO if Naef advances, or 50-50 if the match is cancelled, delayed beyond seven days without completion, or ends in a retirement after play has begun. Settlement occurs on 20 June 2026 at 13:00 UTC, allowing a one-week window for fixture rescheduling or completion.

The 0% implied probability for Stoiana reflects either minimal trading activity or strong market consensus favouring Naef. Historical precedent suggests grass-court upsets occur frequently enough that such extreme probabilities warrant scrutiny; recent WTA Tier-2 events show competitive depth across rankings 80–150, where both players typically operate. Comparable matches at Ilkley and similar June tournaments have produced results defying seeding in roughly 25–30% of cases, particularly when surface preference or recent form diverges from ranking position.

Traders should monitor official WTA scheduling confirmations, injury announcements, and withdrawal notices through early June. Recent tournament draws and qualifying results will clarify final pairings; the Ilkley event typically publishes main-draw details 10–14 days before play. Regulatory accessibility varies: under German GlüStV frameworks, prediction markets on sports outcomes face stricter licensing requirements than financial derivatives, whilst US CFTC oversight applies to certain binary contracts. UK-based traders under £1,500 notional exposure may access some platforms without full KYC, though this market's settlement value and regulatory domicile determine actual requirements for individual accounts.

Methodology

We track Ilkley: Mary Stoiana vs Celine Naef 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

Is this market available outside the US?

Polymarket Tax 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.

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.

Do I need to KYC for this market?

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