Livesport Prague Open, Qualification: Sofia Costoulas vs Ayla Aksu

Platform comparison

Market context

Sofia Costoulas has already defeated Ayla Aksu in a completed WTA encounter, securing a decisive 2–0 victory in their head-to-head record. This match, originally scheduled for the Livesport Prague Open qualification on 19 July 2026, appears to have been a rescheduled or replayed fixture given the existing result, with the crowd-implied probability of 100% YES reflecting the certainty of Costoulas advancing based on prior performance.

In tennis prediction markets, a 100% implied probability typically signals either a completed result or an overwhelming historical dominance that leaves no room for doubt. Comparable cases in WTA qualification rounds show that when a player holds a clean 2–0 sweep against an opponent, especially in recent form, the market rarely corrects unless injury or withdrawal intervenes. Here, the consensus is absolute: Costoulas is the undisputed favourite, and the underdog angle offers no value.

Traders should monitor official WTA entry lists and any late withdrawal notices from the Prague Open qualification draw, as these are the only catalysts that could alter the settlement. No recent news suggests Aksu has gained ground or that Costoulas is unfit; a source like Tennis Majors confirms the 2–0 result as fact, reinforcing the market’s lock-in status [1]. Until a formal cancellation or delay beyond seven days is announced, the 50–50 tie clause remains irrelevant.

Sources: 1

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.