D. Altmaier leads the all-time head-to-head 2-1 against H. Gaston, over 3 matches.
| Surface | D. Altmaier | H. Gaston |
|---|---|---|
| Clay | 1 | 1 |
| Hard | 1 | 0 |
| Date | Winner | Score | Event |
|---|---|---|---|
| July 14, 2026 | D. Altmaier | 2 - 0 | Bastad · 1/16-finals · clay |
| Nov. 5, 2025 | D. Altmaier | 1 - 1 | Metz · 1/8-finals · hard |
| July 23, 2024 | H. Gaston | 2 - 1 | ATP Kitzbuhel · 1/16-finals · clay |