Nottingham Open: Ann Li vs Kimberly Birrell

Platform comparison

Active sub-markets

Market context

Ann Li and Kimberly Birrell are scheduled to meet in the first round of the Nottingham Open on 16 June 2026. Li, ranked in the 80s on the WTA tour, has shown inconsistent form across grass-court preparation events, whilst Birrell, an Australian player with limited recent tour activity, has struggled to maintain a consistent ranking above 150. The 0% implied probability reflects significant uncertainty about match completion rather than a settled view on either player's likelihood of advancing.

Grass-court tournaments frequently experience weather delays and player withdrawals in the week leading up to matches. The Nottingham Open's outdoor surface and British summer conditions create genuine scheduling risk; matches delayed beyond the seven-day window trigger a 50-50 resolution. Additionally, both players have histories of injury-related retirements from matches, which would also resolve the market to 50-50 under the stated terms. Recent WTA reporting has noted elevated withdrawal rates during the grass-court swing as players manage fatigue and minor injuries ahead of Wimbledon.

Traders should monitor both players' participation in warm-up events immediately preceding Nottingham, particularly any late withdrawals or injury announcements. Li's performance at earlier grass tournaments will signal her physical condition and confidence on the surface. Birrell's entry into the draw itself remains uncertain given her limited tour schedule; confirmation of her participation in the week of 9 June would be a key catalyst. Any announcement of coaching changes or significant injury concerns for either player would shift the probability away from the current extreme position.

Methodology

We track Nottingham Open: Ann Li vs Kimberly Birrell 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

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

Where can I trade this market with the lowest fees?

On Sport Prediction, 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 Sport Prediction?

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