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This market has resolved. The prices below are the last we captured from each platform, kept here for reference. Browse the archive →
SportsPre-game oddsevent concluded

Madison Keys vs Qinwen Zheng

TBTheo Berkmann · Sports Markets Writer Resolves Sep 5, 2026Total volume $4.7M5 platforms

Price history

Implied probability over time
Outcome
Side
Platforms (max 3)
KalshiPolymarket
No price history for this platform selection yet.Polymarket and Kalshi carry full lifetime history; others fill in as we capture daily snapshots.

Where to back Madison Keys

Every independent platform that prices this outcome, best price after fees first. The buttons are affiliate links. We may earn a commission if you sign up, and it never changes the odds you see or what you pay.

1
Polymarket5.0
The largest on-chain prediction market
Madison Keys0%no entry fee
Volume$952K
Min · feesNone · No trading
Market closed
2
Matchbook4.5
Low-commission betting exchange
Madison Keys60%no entry fee · commission on winnings
Volume€266
Min · fees£10 · 2% commission
Market closed
3
Smarkets4.5
Low-commission UK exchange
Madison Keys61%no entry fee · commission on winnings
Volume—
Min · fees£10 · 2% commission
Market closed
4
Kalshi4.9
The first CFTC-regulated US event exchange
Madison Keysafter fees93%93% price + 0.5% entry fee
Volume$3.7M
Min · feesNone · Per-contract trading
Market closed
5
SX Bet4.1
On-chain peer-to-peer sports exchange
Madison Keys94%no entry fee · commission on winnings
Volume—
Min · feesNone · Small fee
Market closed

Ranked by the effective price after each platform's own entry fee. Fees shown are each platform's own and may change. We don't set or control them. Betting exchanges (e.g. Matchbook, Smarkets) instead charge commission on winnings, so they stay at their raw price here.

Implied probability by platform

Lowest tradable raw price per outcome in gold · click a row
OutcomeKalshi4.9Matchbook4.5Polymarket5.0Smarkets4.5SX Bet4.1
Madison Keys93%60%0%61%94%
Qinwen Zheng8%41%100%41%12%

These are raw implied probabilities; gold marks the lowest raw price we can confirm is tradable. A price on a book too wide to trade is shown, but never marked. The Best odds above ranks by the price after each platform's entry fee, so the best place to trade can differ from the lowest raw number here.

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