Livesport Prague Open: Ayla Aksu vs Sofia Costoulas

Platform comparison

Market context

Ayla Aksu and Sofia Costoulas are set to contest the final of the Livesport Prague Open, a WTA event originally scheduled for 20 July 2026, with the winner advancing to the next stage of the tournament. The prediction market currently implies a 100% probability that Aksu will win, yet this stands in stark contrast to sportsbook lines and analyst consensus, which heavily favour Costoulas.

Historical precedents in women’s tennis show that when prediction markets assign near-certain probabilities to one player while betting odds and models point decisively to the other, the divergence often signals either a mispriced contract or delayed information. In this case, multiple analytics models—including those from Stats Insider and Dimers—assign Costoulas a 66% win chance, with betting odds ranging from 1.39 to 1.40, implying a 71–73% probability. Umpiry and Tennis Tonic also back Costoulas, citing her stronger form and head-to-head edge, while OddsWasp oddly splits the chance at 50–50, highlighting the lack of consensus among some outlets.

Traders should monitor the official WTA schedule for any match postponements or cancellations, as the market resolves to 50–50 if the match is not completed within seven days. Recent coverage from Bleacher Nation and Tennis Tonic confirms Costoulas as the pick to win in two sets, suggesting the 100% Aksu probability may reflect a data error or unresolved settlement condition rather than genuine market confidence. Any announcement confirming the match’s status or a change in player availability will be the primary catalyst for price movement.

Sources: 1 · 2 · 3 · 4 · 5

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 PolyGram, which mirrors the Polymarket order book directly.

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 PolyGram 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.