

Iga Swiatek defeated Marta Kostyuk 6-2 6-1 in the Indian Wells semi-final on hard. The result followed the form book — Iga Swiatek came in ranked #5, leading the head-to-head 3–1, defending last year's semi-final. Iga Swiatek extended the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2026-08-08 | Toronto | R16 | hard | Iga Swiatek | 6-3 1-6 2-6 |
| 2026-05-31 | Roland Garros | R16 | clay | Marta Kostyuk | 7-5 6-1 |
| 2024-08-12 | Cincinnati | R16 | hard | Iga Swiatek | 6-2 6-2 |
| 2021-05-31 | Roland Garros | R16 | clay | Iga Swiatek | 6-3 6-4 |
Averages over each player's completed matches in the selected window (199 vs 130). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Swiatek I.: 2 days rest · 4 matches, 81 games (7d) · Kostyuk M.: 1 day rest · 2 matches, 55 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 hard field, opponent-adjusted over 52 weeks). About