Wimbledon WTA: Irina-Camelia Begu vs Katie Swan

Platform comparison

Market context

The real-world event is the Round of 128 WTA match between Irina-Camelia Begu and Katie Swan at Wimbledon, which kicked off on Tuesday, 30 June 2026. In the last 24 hours, the match has already concluded with Katie Swan defeating Begu 6-4, 6-4, rendering the current 0% crowd-implied probability for Begu advancing a factual certainty rather than a speculative forecast. This outcome confirms Swan’s dominance on the day and eliminates any ambiguity regarding the market’s resolution, as the result is now verified by official WTA records[3].

Historically, similar early-round Wimbledon mismatches where one player secures a straight-sets victory often see prediction markets collapse to near-zero for the loser within minutes of the final ball, mirroring today’s settlement. Comparable cases from 2024 and 2025 show that once a match is completed and a winner is determined, markets resolving to the loser’s advancement typically settle at 0% with no further volatility, as the event is closed and unchangeable[1]. Traders should note that retirement or cancellation rules do not apply here, as the match was fully played and completed without delay.

For traders monitoring this market, the primary catalyst is the official WTA score confirmation, which has already been published and confirms Swan’s win[3]. No further announcements, schedule changes, or dependencies are relevant, as the settlement window ends on 6 July 2026, but the result is already fixed. Recent odds data from FanDuel and other bookmakers also reflected Swan’s strong position prior to the match, aligning with the final outcome[9]. The market is now purely a record of a completed event, with no actionable catalysts remaining for new information.

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). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.