01/By surface
each with its own count, at equal weight
Hard
2-4
J. leads 4-2 in 6 meetings on hard
Clay
1-0
M. leads 1-0 in 1 meeting on clay
Grass
Never on grass
no meeting on this surface
02/Every meeting
7 rows, newest first
| Date | Tournament | Surface | Round | Winner | Score, winner first | Ranks, M. first |
|---|---|---|---|---|---|---|
| Apr 26, 2026 | Mutua Madrid OpenWTA1000 | clay | 3rd round | Kostyuk M. | 6-1, 6-4 | 23 v 5 |
| Jan 10, 2026 | Brisbane InternationalWTA500 | hard | semifinal | Kostyuk M. | 6-0, 6-3 | 26 v 6 |
| Oct 1, 2025 | China OpenWTA1000 | hard | 4th round | Pegula J. | 6-3, 6-7, 6-1 | 28 v 7 |
| Mar 24, 2025 | Miami OpenWTA1000 | hard | 4th round | Pegula J. | 6-2, 6-3 | 29 v 4 |
| Mar 3, 2024 | San Diego OpenWTA500 | hard | semifinal | Kostyuk M. | 7-6, 6-1 | 34 v 5 |
| Jan 20, 2023 | Australian OpenGrand Slam | hard | 3rd round | Pegula J. | 6-0, 6-2 | 61 v 3 |
| Aug 17, 2022 | Western & Southern Financial Group Women's OpenWTA1000 | hard | 2nd round | Pegula J. | 6-7, 6-1, 6-2 | 74 v 8 |
A record, never a share of meetings. Main-draw singles since 2013; a meeting ended by retirement is counted with the sets that were played and marked; a walkover is listed and counted in neither column. Kostyuk M. and Pegula J. each carry the table against every opponent faced.