Warsaw: Teodora Kostovic vs Martyna Kubka

Platform comparison

Market context

The last 24–48 hours have moved this from a scheduled opener into a live match context: Teodora Kostovic and Martyna Kubka were listed for the Warsaw event on an outdoor hard court, with both players in the main draw and the match underway on 3 August. Current market pricing at 0% YES suggests the contract is already being treated as effectively settled against a Kostovic advance, rather than as a simple pre-match coin flip.[1][8]

Recent form and direct history point in different directions, which is useful for reading why a market can still sit near zero despite a plausible tennis matchup. The players are close in ranking, with Kostovic around WTA No. 146 and Kubka around No. 187, but the pair’s only listed head-to-head was won by Kubka in straight sets at Leimen in 2025. That prior result is the clearest comparable case available here, and it sits alongside a modest ranking edge for Kostovic, so the price is more likely reflecting match state or completion risk than pure baseline strength.[1][2][11]

The main catalysts now are operational rather than speculative: whether the Warsaw schedule continues without interruption, whether the match completes, and whether any retirement, walkover or abandonment changes the settlement path before the window closes on 10 August. Live score feeds show the match active and the event surface as outdoor hard, while some listings have shifted the start time, which is a reminder that official tournament updates matter more than preview pages once play is under way.[1][3][8][13]

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 Prediction Today, 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 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.