Pronóstico: National Bank Open: Marta Kostyuk vs Madison Keys

Platform comparison

Market context

Marta Kostyuk’s match with Madison Keys at the National Bank Open has a clear historical tilt: Keys leads the head-to-head and has beaten Kostyuk in straight sets in both of their previous meetings at Wimbledon in 2023 and 2024.[1][2] That record matters because it shows Keys has repeatedly found a way through the matchup, even if the sample is small. On broader recent form, Keys has posted a stronger win rate across the last 52 weeks than Kostyuk in the available stat feeds, which supports why the crowd is shading her favourite.[1][2]

The market’s 55% YES price is still not a strong endorsement, though, because hard-court outcomes can swing on fitness and scheduling as much as ranking gaps. Kostyuk has been tracking towards another deep run at the event, while Keys’ Canadian Open record has been more uneven, with limited appearances at the later stages in this tournament.[15] Traders should watch for any late injury or withdrawal updates, plus whether the match is played on schedule; the settlement rules mean a cancellation, no-result, or delay of more than seven days would push the market to 50-50 rather than a player win. The official match listing and live scoring feeds are the main places to monitor draw status and completion.[5][10][14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Football-specific comparison page for Pronóstico: National Bank Open: Marta Kostyuk vs Madison Keys. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi (US-focused) or Manifold (play-money).

Resolution & payout

Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.

FAQ

When do sports markets resolve?

Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.

What are live sports odds on Polymarket?

Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.

How fast do sports winnings settle?

Once the official league outcome is logged in the UMA Oracle (typically 1-2 hours after the final whistle), Polymarket's smart contract triggers USDC payout. To your wallet within minutes.

What's the difference between match odds and outright odds?

Match odds cover a single game ("Bayern beats BVB"). Outright odds are long-term aggregates ("Bayern wins the league"). Outright markets have deeper liquidity; match markets have faster resolution.

Can I import form data and lineups?

This page shows the live Polymarket quote as an implied probability. Form data and lineups must be researched separately via sports data providers (e.g. Soccerway, ESPN, FBref) — we surface the market probability, not the sport analysis.