K. Birrell and J. Pegula are level 1-1 in their head-to-head since 2018 over 2 matches.
| Surface | K. Birrell | J. Pegula |
|---|---|---|
| Clay | 1 | 0 |
| Hard | 0 | 1 |
| Date | Winner | Score | Event |
|---|---|---|---|
| May 26, 2026 | K. Birrell | 2 - 1 | French Open · 1/64-finals · clay |
| Aug. 10, 2025 | J. Pegula | 2 - 0 | Cincinnati · 1/32-finals · hard |