D. Altmaier and R. Hijikata are level 1-1 in their head-to-head since 2018 over 2 matches.
| Surface | D. Altmaier | R. Hijikata |
|---|---|---|
| Clay | 1 | 0 |
| Hard | 0 | 1 |
| Date | Winner | Score | Event |
|---|---|---|---|
| May 18, 2026 | D. Altmaier | 2 - 0 | Hamburg · 1/16-finals · clay |
| Aug. 4, 2024 | R. Hijikata | 2 - 0 | Montreal · Semi-finals · hard |