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National Bank Open: Marta Kostyuk vs Madison Keys
Resolved: Marta Kostyuk
Flags
7
Net whale flow → Marta Kostyuk
+$23.7k
Marta Kostyuk 7d ago → now
—
Category
Sports
Live on this marketconnecting…
Loading the latest $10k+ trades from Polymarket…
Straight from Polymarket's public trade feed, refreshed every 10s while this tab is open. Grades appear after markets resolve. Information, not advice.
Who's on each side
Whale money on this market, split by track record. Proven wallets beat the price over 20+ graded bets; losing wallets clearly lost to it. Everyone else is unrated.
| Side | All whales | Proven | Losing |
|---|---|---|---|
| Madison Keys | $99.0k 2 flags |
none | none |
| Marta Kostyuk | $81.8k 4 flags |
$36.3k 1 wallet |
none |
| Not Madison Keys | $40.9k 1 flag |
none | none |
A proven wallet on a side is a reason to look closer, not a verdict. Records come from past bets; see how to use this. Information, not advice.
Flags on this market
| Flag | Size | Result |
|---|---|---|
| LOW BUY Marta Kostyuk @ 97.5¢ | $12.7k | excluded |
| MED BUY Marta Kostyuk @ 95.1¢ | $36.3k | excluded |
| LOW BUY Marta Kostyuk @ 97.5¢ | $20.0k | excluded |
| LOW BUY Marta Kostyuk @ 80¢ | $12.8k | excluded |
| LOW BUY Madison Keys @ 46¢ | $49.6k | excluded |
| LOW SELL Madison Keys @ 43¢ | $40.9k | excluded |
| LOW BUY Madison Keys @ 47¢ | $49.3k | missed |
Summary
WhaleGrader has logged 7 whale trades on this market totalling $221.7k from 5 wallets. The largest was $49.6k (buy Madison Keys at 46¢). Most whale money ($99.0k) went to Madison Keys. 5 of 7 graded flags here called the outcome. The biggest whale here, 0x5f65…2036 ($139.9k), has called 2 of 4 graded flags overall (+11.8 pts vs price).
Market data from Polymarket (wta-kostyuk-keys-2026-08-05).