

Marta Kostyuk defeated Jessica Pegula 6-1 6-4 in the Madrid round of 32 on clay. The upset overturned the form book — Jessica Pegula came in ranked #3, leading the head-to-head 4–2, defending last year's round of 32. Marta Kostyuk narrowed the head-to-head to 4–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2026-01-04 | Brisbane | SF | hard | Marta Kostyuk | 6-0 6-3 |
| 2025-09-24 | Beijing | R16 | hard | Jessica Pegula | 6-3 6-7 6-1 |
| 2025-03-18 | Miami | R16 | hard | Jessica Pegula | 6-2 6-3 |
| 2024-02-26 | San Diego | SF | hard | Marta Kostyuk | 7-6 6-1 |
| 2023-01-16 | Australian Open | R32 | hard | Jessica Pegula | 6-0 6-2 |
| 2022-08-15 | Cincinnati | R32 | hard | Jessica Pegula | 6-7 6-1 6-2 |
Averages over each player's completed matches in the selected window (31 vs 37). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Kostyuk M.: 1 day rest · 3 matches, 79 games (7d) · Pegula J.: 1 day rest · 3 matches, 67 games (7d). Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Per-surface Serve / Return Rating (0–100, percentile within the clay field, opponent-adjusted over 52 weeks). About