Livesport Prague Open: Ayla Aksu vs Sofia Costoulas

Platform comparison

Market context

Ayla Aksu faces Sofia Costoulas in the opening round of the Livesport Prague Open, a WTA 250 event originally set for 20 July 2026. The match has already concluded with Costoulas advancing 6–3, 6–2, meaning the prediction market resolving to “Sofia Costoulas” is effectively settled. Despite this, the contract shows a 100% YES crowd-implied probability, suggesting traders are pricing in the confirmed result rather than uncertainty.

Historically, prediction markets on completed tennis matches that resolve post-event often converge rapidly to 100% once the outcome is public, as seen in similar WTA contracts where odds diverged briefly before settling. In this case, sportsbooks like 1xBet initially priced Costoulas at 1.96 and Aksu at 3.50, while Tennis Tonic’s analyst pick favoured Costoulas at 1.39 odds, aligning closely with the final result. The divergence between early bookmaker lines and the current 100% market probability reflects the transition from pre-match uncertainty to post-match certainty.

Traders should monitor official WTA match reports and tournament draw updates to confirm the result’s validity and check for any potential disqualifications or retires that could alter settlement. No recent news suggests disruption, and the match result is already recorded on Tennis Explorer and Polymarket with $459.50K volume, reinforcing confidence in the outcome. With the settlement window ending 27 July 2026, the market is effectively closed to new information.

Sources: 1 · 2 · 3

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Kalshi vs Polymarket, which mirrors the Polymarket order book directly.

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 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.