Lexus Eastbourne Open: Caty McNally vs Petra Marcinko

Platform comparison

Active sub-markets

Market context

The real-world event is the tennis match between Caty McNally and Petra Marcinko at the Lexus Eastbourne Open, scheduled for 11:30 AM ET on 25 June 2026 at Devonshire Park in Eastbourne, Great Britain. This grass-court fixture is part of the WTA 250 tournament running from 22 to 27 June 2026, with the market resolving to the player who advances, or to a 50-50 split if the match is canceled, tied, or delayed beyond seven days without a winner.

Historically, prediction markets showing 100% YES crowd-implied probability for a specific player to advance in early-round tennis matches at grass tournaments have rarely settled against that player unless the match was canceled or the player withdrew before play. Comparable cases from the 2025 Eastbourne Open and other WTA 250 grass events show that when a player is heavily favoured and the match begins, the outcome almost always aligns with the pre-match probability, with cancellations being the primary exception rather than unexpected losses.

Traders approaching this market programmatically should monitor official draw updates, player injury announcements, and weather dependencies that could delay play, as these are the only catalysts that could alter the 100% probability outcome. The WTA Official tournament overview confirms the schedule and surface details, while the LTA fan zone provides real-time updates on lineups and match status, making these sources critical for conditional order execution or copy-trading bots that rely on live data feeds to adjust positions before settlement.

Sources: 1 · 2 · 3 · 4 · 5

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

Where can I trade this market with the lowest fees?

On PolyGram, 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?

PolyGram 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 PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram 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.