K. Birrell and P. Marcinko are level 1-1 in their head-to-head since 2018 over 2 matches.
| Surface | K. Birrell | P. Marcinko |
|---|---|---|
| Grass | 0 | 1 |
| Hard | 1 | 0 |
| Date | Winner | Score | Event |
|---|---|---|---|
| June 24, 2026 | P. Marcinko | 2 - 0 | Eastbourne · 1/8-finals · grass |
| Feb. 24, 2026 | K. Birrell | 2 - 1 | WTA Austin · 1/16-finals · hard |