Daniel Altmaier leads 2 to 1 over 3 singles meetings since 2023. Last meeting on 30/06/2025 at Wimbledon - London.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 30/06/2025 | Wimbledon - London | Round 1 | grass | Diallo | 6-1 6-2 6-4 |
| 20/11/2024 | Davis Cup, World Group, QF, GER-CAN | — | indoor hard | Altmaier | 7-6(5) 6-4 |
| 14/04/2023 | Sarasota Challenger | Quarter-final | clay | Altmaier | 4-2 |
| grass | Altmaier 0 - 1 Diallo |
| indoor hard | Altmaier 1 - 0 Diallo |
| clay | Altmaier 1 - 0 Diallo |
| 2025 | Altmaier 0 - 1 Diallo |
| 2024 | Altmaier 1 - 0 Diallo |
| 2023 | Altmaier 1 - 0 Diallo |
195 wins, 176 losses since 2021 (52.6%).
Last matches: V D V D D
163 wins, 112 losses since 2021 (59.3%).
Last matches: D V D V D
Daniel Altmaier leads 2 to 1 over 3 singles meetings since 2023.
On 30/06/2025, at Wimbledon - London (Round 1): Gabriel Diallo won 6-1 6-2 6-4.