01/By surface
each with its own count, at equal weight
Hard
4-2
J. leads 4-2 in 6 meetings on hard
Clay
0-1
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, J. first |
|---|---|---|---|---|---|---|
| Apr 26, 2026 | Mutua Madrid OpenWTA1000 | clay | 3rd round | Kostyuk M. | 6-1, 6-4 | 5 v 23 |
| Jan 10, 2026 | Brisbane InternationalWTA500 | hard | semifinal | Kostyuk M. | 6-0, 6-3 | 6 v 26 |
| Oct 1, 2025 | China OpenWTA1000 | hard | 4th round | Pegula J. | 6-3, 6-7, 6-1 | 7 v 28 |
| Mar 24, 2025 | Miami OpenWTA1000 | hard | 4th round | Pegula J. | 6-2, 6-3 | 4 v 29 |
| Mar 3, 2024 | San Diego OpenWTA500 | hard | semifinal | Kostyuk M. | 7-6, 6-1 | 5 v 34 |
| Jan 20, 2023 | Australian OpenGrand Slam | hard | 3rd round | Pegula J. | 6-0, 6-2 | 3 v 61 |
| Aug 17, 2022 | Western & Southern Financial Group Women's OpenWTA1000 | hard | 2nd round | Pegula J. | 6-7, 6-1, 6-2 | 8 v 74 |
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. Pegula J. and Kostyuk M. each carry the table against every opponent faced.