M. Kubka leads the head-to-head 2-0 since 2018 against T. Kostovic, over 2 matches.
| Surface | M. Kubka | T. Kostovic |
|---|---|---|
| Hard | 2 | 0 |
| Date | Winner | Score | Event |
|---|---|---|---|
| Aug. 3, 2026 | M. Kubka | 2 - 1 | Warsaw · 1/16-finals · hard |
| Feb. 28, 2025 | M. Kubka | 2 - 0 | W15 Leimen · Quarter-finals · hard |