Spain: Barcelona - Singles - Main |
| 1/16-finals | Altmaier D. | Fils A. | 1:2 (4:6, 6:1, 1:6) | details | 17.04.2024 |
| 1/32-finals | Altmaier D. | Popyrin A. | 2:0 (6:3, 7:64) | details | 16.04.2024 |
Monaco: Monte Carlo - Singles - Main |
| 1/32-finals | Cerundolo F. | Altmaier D. | 2:0 (6:2, 7:63) | details | 08.04.2024 |
Monaco: Monte Carlo - Singles - Qualification |
| Final | Altmaier D. | Moutet C. | 0:2 (2:6, 4:6) | details | 07.04.2024 |
| Semi-finals | Altmaier D. | van Assche L. | 2:1 (2:6, 6:2, 6:3) | details | 06.04.2024 |
Portugal: Estoril - Singles - Main |
| 1/16-finals | Altmaier D. | Martinez P. | 0:2 (4:6, 2:6) | details | 03.04.2024 |
USA: Miami - Singles - Main |
| 1/32-finals | Altmaier D. | Struff J-L. | 0:2 (3:6, 3:6) | details | 24.03.2024 |
| 1/64-finals | Altmaier D. | Mayot H. | 2:0 (6:2, 7:5) | details | 21.03.2024 |
USA: Indian Wells - Singles - Main |
| 1/64-finals | Pouille L. | Altmaier D. | 2:0 (6:4, 6:3) | details | 07.03.2024 |
Mexico: Acapulco - Singles - Main |
| 1/8-finals | Altmaier D. | Kecmanovic M. | 0:2 (4:6, 4:6) | details | 29.02.2024 |
| 1/16-finals | Zverev A. | Altmaier D. | 1:2 (3:6, 6:3, 3:6) | details | 28.02.2024 |
Argentina: Buenos Aires - Singles - Main |
| 1/16-finals | Diaz Acosta F. | Altmaier D. | 2:0 (6:3, 7:61) | details | 12.02.2024 |
Argentina: Cordoba - Singles - Main |
| 1/16-finals | Coria F. | Altmaier D. | 2:1 (5:7, 6:3, 6:4) | details | 06.02.2024 |
Australia: Australian Open - Singles - Main |
| 1/64-finals | Altmaier D. | Khachanov K. | 1:3 (7:5, 3:6, 65:7, 63:7) | details | 15.01.2024 |
New Zealand: Auckland - Singles - Main |
| Quarter-finals | Fils A. | Altmaier D. | 1:0 RET. (7:62, 1:0) | details | 11.01.2024 |
| 1/8-finals | Altmaier D. | Auger-Aliassime F. | 2:0 (7:69, 7:5) | details | 10.01.2024 |
| 1/16-finals | Altmaier D. | Giron M. | 2:0 (7:65, 6:2) | details | 08.01.2024 |
Australia: Brisbane - Singles - Main |
| 1/8-finals | Altmaier D. | Dimitrov G. | 0:2 (1:6, 2:6) | details | 04.01.2024 |
| 1/16-finals | Tu L. | Altmaier D. | 0:2 (65:7, 64:7) | details | 02.01.2024 |
France: Metz - Singles - Main |
| 1/16-finals | Altmaier D. | Valkusz M. | 0:2 (2:6, 2:6) | details | 07.11.2023 |
| 1/16-finals | Altmaier D. | Gaston H. | CAN. | details | 05.11.2023 |
France: Paris - Singles - Main |
| 1/8-finals | Altmaier D. | Rune H. | 0:2 (3:6, 3:6) | details | 02.11.2023 |
| 1/16-finals | Fritz T. | Altmaier D. | WO. | details | 01.11.2023 |
| 1/32-finals | Altmaier D. | Fils A. | 2:0 (6:2, 6:4) | details | 31.10.2023 |
France: Paris - Singles - Qualification |
| Semi-finals | Altmaier D. | Zapata Miralles B. | CAN. | details | 28.10.2023 |
Austria: Vienna - Singles - Main |
| 1/16-finals | Monfils G. | Altmaier D. | 2:0 (6:4, 6:4) | details | 25.10.2023 |
Japan: Tokyo - Singles - Main |
| 1/16-finals | Paul T. | Altmaier D. | 2:1 (3:6, 6:1, 6:3) | details | 16.10.2023 |
China: Shanghai - Singles - Main |
| 1/64-finals | Altmaier D. | Nishioka Y. | 1:2 (4:6, 6:3, 62:7) | details | 04.10.2023 |
China: Beijing - Singles - Qualification |
| Semi-finals | Harris L. | Altmaier D. | 2:0 (6:3, 6:1) | details | 26.09.2023 |
World: Davis Cup - World Group I - Singles - Main |
| | Dzumhur D. | Altmaier D. | CAN. | details | 17.09.2023 |
| | Fatic N. | Altmaier D. | 0:2 (65:7, 2:6) | details | 16.09.2023 |
USA: US Open - Singles - Main |
| 1/32-finals | Zverev A. | Altmaier D. | 3:1 (7:61, 3:6, 6:4, 6:3) | details | 31.08.2023 |
| 1/64-finals | Altmaier D. | Lestienne C. | 3:1 (65:7, 6:3, 6:1, 6:2) | details | 29.08.2023 |
USA: Cincinnati - Singles - Main |
| 1/32-finals | Popyrin A. | Altmaier D. | 2:1 (65:7, 6:4, 6:4) | details | 15.08.2023 |
| 1/32-finals | Khachanov K. | Altmaier D. | CAN. | details | 15.08.2023 |
USA: Cincinnati - Singles - Qualification |
| Final | Altmaier D. | Moutet C. | 0:2 (4:6, 4:6) | details | 13.08.2023 |
| Semi-finals | Altmaier D. | O'Connell C. | 2:1 (3:6, 7:65, 6:4) | details | 12.08.2023 |
Austria: Kitzbuhel - Singles - Main |
| 1/8-finals | Galan D. E. | Altmaier D. | 2:1 (3:6, 6:2, 7:68) | details | 02.08.2023 |
| 1/16-finals | Huesler M. | Altmaier D. | 1:2 (7:65, 2:6, 4:6) | details | 01.08.2023 |
Germany: Hamburg - Singles - Main |
| Quarter-finals | Zhang Z. | Altmaier D. | 2:0 (6:4, 6:4) | details | 28.07.2023 |
| 1/8-finals | Altmaier D. | Rublev A. | 2:0 (6:2, 6:2) | details | 27.07.2023 |
| 1/16-finals | Altmaier D. | Gasquet R. | 2:0 (7:5, 6:4) | details | 24.07.2023 |
Switzerland: Gstaad - Singles - Main |
| 1/8-finals | Hanfmann Y. | Altmaier D. | 2:1 (4:6, 6:2, 7:5) | details | 19.07.2023 |
| 1/16-finals | Bonzi B. | Altmaier D. | 0:2 (3:6, 4:6) | details | 17.07.2023 |
Germany: Braunschweig - Singles - Main |
| Quarter-finals | Altmaier D. | Agamenone F. | 1:2 (3:6, 6:2, 3:6) | details | 13.07.2023 |
| 1/8-finals | Altmaier D. | Passaro F. | 2:0 (6:2, 6:0) | details | 12.07.2023 |
| 1/16-finals | Altmaier D. | Taberner C. | 2:0 (6:3, 6:3) | details | 11.07.2023 |