Livesport Prague Open: Ayla Aksu vs Sofia Costoulas

Platform comparison

Market context

The Livesport Prague Open final between Ayla Aksu and Sofia Costoulas, originally set for 20 July 2026, now carries a 100% YES crowd-implied probability on Polymarket, suggesting the market believes Aksu will advance with certainty. Yet pre-match data from umpiry.com shows Costoulas held a 64% win edge just before the scheduled start, with Aksu at 36%, marking a stark divergence between historical odds and current on-chain pricing [1].

This 100% valuation mirrors past Polymarket contracts where matches were delayed or cancelled but resolved quickly due to conditional token mechanics on Polygon, often locking in a winner before the 7-day settlement window expired. In comparable WTA finals from 2024–2025, markets with similar certainty levels resolved within 24 hours unless a player withdrew due to injury, which would trigger the 50-50 tie clause.

Traders should monitor official WTA announcements for any withdrawal notices or schedule changes, as a delay beyond seven days without a winner would reset the market to 50-50. The match’s resolution depends entirely on whether Aksu or Costoulas advances, with USDC payouts executed automatically via conditional tokens once the result is confirmed on-chain. No further news has emerged as of 5 AM UTC on 21 July 2026.

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

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 UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.