Ilkley: Mary Stoiana vs Celine Naef

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Active sub-markets

Market context

Mary Stoiana and Celine Naef are scheduled to meet in the opening rounds of the Ilkley grass-court tournament on 13 June 2026. The market currently reflects zero probability of Stoiana advancing, suggesting either strong consensus around Naef's superiority or minimal trading activity at this early stage. With settlement occurring just over a week after the scheduled match date, any delay beyond 20 June triggers a 50-50 resolution, creating a structural risk for traders holding positions through the event window.

Stoiana and Naef occupy different tiers of the professional circuit. Naef has established herself as a consistent WTA-level competitor with multiple main-draw appearances at ranking tournaments, whilst Stoiana has competed primarily on the ITF and lower-tier professional circuits. Head-to-head records between players at this level often reflect broader ranking gaps rather than match-specific form, though grass courts can occasionally produce upsets given their faster surface and shorter rally lengths. The 0% implied probability suggests the market has already priced in a substantial Naef advantage rather than assessing genuine match uncertainty.

Traders should monitor official draw confirmations from the Ilkley tournament organisers and any late withdrawals or injury announcements affecting either player in the fortnight before play. Recent grass-court warm-up results for both competitors will carry weight—Stoiana's performance at ITF events in May and early June, and Naef's results at any WTA 250 or 125K events preceding Ilkley, will signal current form. Weather conditions at Ilkley, particularly rain delays that might compress the schedule, represent a secondary consideration given the 7-day grace period before forced 50-50 resolution.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Is this market available outside the US?

Who Will Win 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.

What does it cost to trade on Who Will Win?

Zero. Who Will Win 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, Who Will Win triggers a quick verification flow that finishes in minutes.