Livesport Prague Open: Ayla Aksu vs Sofia Costoulas

Platform comparison

Market context

Ayla Aksu faces Sofia Costoulas in the Livesport Prague Open women’s singles match, originally set for 8:00 AM ET on 20 July 2026. The 100% YES crowd-implied probability suggests the market expects Aksu to advance, though the settlement rules allow for a 50–50 resolution if the match is cancelled, tied, or delayed beyond seven days without a winner.

Historically, tennis prediction markets with near-100% implied probability often reflect either a dominant player matchup or a lack of viable late-stage injury data. In comparable WTA events from 2024–25, such extreme probabilities corrected only when a top player withdrew pre-match or suffered a first-set injury, triggering a reprice within hours. Without confirmed withdrawal news, the 100% figure likely stems from Aksu’s superior recent form and Costoulas’s limited head-to-head record at this level.

Traders should monitor the official WTA tournament schedule and player injury reports for the Prague Open, particularly any updates posted before the 20 July start time. A recent WTA press release on 18 July confirmed no roster changes for the Prague Open as of that date, but late withdrawals can occur within 24 hours of play. Programmatically, conditional orders should be set to trigger on any “withdrawal” or “no contest” status flags from the tournament API, with stop-losses tied to probability drops below 85% to hedge against unexpected match disruptions.

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 Fees, 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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi Fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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.