Spain: Barcelona - Singles - Main |
| Quarter-finals | Fils A. | Lajovic D. | 1:2 (4:6, 6:3, 2:6) | details | 19.04.2024 |
| 1/8-finals | Davidovich Fokina A. | Lajovic D. | 1:2 (610:7, 6:3, 1:6) | details | 18.04.2024 |
| 1/16-finals | Lajovic D. | Humbert U. | 2:0 (6:4, 6:4) | details | 17.04.2024 |
| 1/32-finals | Schwartzman D. | Lajovic D. | 0:2 (1:6, 2:6) | details | 16.04.2024 |
Monaco: Monte Carlo - Singles - Qualification |
| Semi-finals | Lajovic D. | Muller A. | 0:2 (2:6, 3:6) | details | 06.04.2024 |
USA: Miami - Singles - Main |
| 1/64-finals | Lajovic D. | Monfils G. | 0:2 (65:7, 4:6) | details | 22.03.2024 |
USA: Indian Wells - Singles - Main |
| 1/32-finals | Tiafoe F. | Lajovic D. | 2:0 (6:3, 6:3) | details | 09.03.2024 |
| 1/64-finals | Lajovic D. | Ruusuvuori E. | 2:0 (7:5, 6:2) | details | 07.03.2024 |
Mexico: Acapulco - Singles - Main |
| 1/8-finals | Ruud C. | Lajovic D. | 2:0 (6:4, 7:5) | details | 29.02.2024 |
| 1/16-finals | Pacheco Mendez R. | Lajovic D. | 0:2 (2:6, 2:6) | details | 28.02.2024 |
Brazil: Rio de Janeiro - Singles - Main |
| Quarter-finals | Cerundolo F. | Lajovic D. | 2:1 (3:6, 6:4, 6:4) | details | 23.02.2024 |
| 1/8-finals | Lajovic D. | Djere L. | 2:0 (6:2, 7:5) | details | 22.02.2024 |
| 1/16-finals | Lajovic D. | Galan D. E. | 2:1 (4:6, 7:68, 6:1) | details | 20.02.2024 |
Argentina: Buenos Aires - Singles - Main |
| Quarter-finals | Lajovic D. | Diaz Acosta F. | 0:2 (4:6, 3:6) | details | 16.02.2024 |
| 1/8-finals | Lajovic D. | Tabilo A. | 2:1 (6:4, 1:6, 6:1) | details | 14.02.2024 |
| 1/16-finals | Fils A. | Lajovic D. | 0:2 (3:6, 4:6) | details | 13.02.2024 |
World: Davis Cup - World Group - Singles - Qualification |
| | Lajovic D. | Klein L. | CAN. | details | 03.02.2024 |
| | Lajovic D. | Molcan A. | 1:2 (6:4, 2:6, 0:6) | details | 02.02.2024 |
Australia: Australian Open - Singles - Main |
| 1/64-finals | Lajovic D. | Zeppieri G. | 1:3 (3:6, 6:3, 3:6, 63:7) | details | 16.01.2024 |
Australia: Adelaide - Singles - Main |
| 1/8-finals | Lehecka J. | Lajovic D. | 2:1 (7:5, 4:6, 6:3) | details | 10.01.2024 |
| 1/16-finals | Lajovic D. | Kokkinakis T. | 2:1 (3:6, 6:1, 6:4) | details | 08.01.2024 |
France: Paris - Singles - Main |
| 1/16-finals | Lajovic D. | De Minaur A. | 1:2 (6:4, 4:6, 4:6) | details | 01.11.2023 |
| 1/32-finals | Lajovic D. | Bonzi B. | 2:0 (7:5, 6:3) | details | 31.10.2023 |
France: Paris - Singles - Qualification |
| Final | Lajovic D. | Giron M. | 1:2 (5:7, 7:5, 64:7) | details | 29.10.2023 |
| Semi-finals | Lajovic D. | Halys Q. | 2:1 (3:6, 7:5, 7:60) | details | 28.10.2023 |
Switzerland: Basel - Singles - Main |
| 1/16-finals | Lajovic D. | Hurkacz H. | 0:2 (62:7, 3:6) | details | 24.10.2023 |
Sweden: Stockholm - Singles - Main |
| 1/16-finals | Lajovic D. | Sonego L. | 1:2 (6:4, 3:6, 4:6) | details | 16.10.2023 |
China: Shanghai - Singles - Main |
| 1/16-finals | Lajovic D. | Marozsan F. | 0:2 (3:6, 3:6) | details | 08.10.2023 |
| 1/32-finals | Griekspoor T. | Lajovic D. | 0:1 RET. (4:6, 2:3) | details | 06.10.2023 |
| 1/64-finals | Lajovic D. | Wawrinka S. | 2:0 (6:4, 7:67) | details | 04.10.2023 |
China: Beijing - Singles - Qualification |
| Semi-finals | Hanfmann Y. | Lajovic D. | 2:0 (6:3, 7:67) | details | 26.09.2023 |
China: Chengdu - Singles - Main |
| 1/8-finals | Thompson J. | Lajovic D. | 2:0 (6:1, 7:61) | details | 22.09.2023 |
| 1/16-finals | Bergs Z. | Lajovic D. | 1:2 (4:6, 6:1, 3:6) | details | 21.09.2023 |
World: Davis Cup - World Group - Singles - Main |
| | Lajovic D. | Mensik J. | 0:2 (3:6, 2:6) | details | 16.09.2023 |
| | Lajovic D. | Hong S. C. | 2:0 (6:4, 7:63) | details | 12.09.2023 |
USA: US Open - Singles - Main |
| 1/64-finals | Wu Y. | Lajovic D. | 3:2 (3:6, 6:4, 2:6, 6:4, 6:2) | details | 29.08.2023 |
USA: Cincinnati - Singles - Main |
| 1/8-finals | Lajovic D. | Fritz T. | 0:0 RET. (0:5) | details | 18.08.2023 |
| 1/16-finals | Sinner J. | Lajovic D. | 0:2 (4:6, 64:7) | details | 16.08.2023 |
| 1/32-finals | Cerundolo F. | Lajovic D. | 0:2 (3:6, 4:6) | details | 14.08.2023 |
USA: Cincinnati - Singles - Qualification |
| Final | Kubler J. | Lajovic D. | 0:2 (4:6, 4:6) | details | 13.08.2023 |
| Semi-finals | Hijikata R. | Lajovic D. | 0:2 (3:6, 3:6) | details | 12.08.2023 |
Austria: Kitzbuhel - Singles - Main |
| 1/16-finals | Lajovic D. | Zhang Z. | 0:2 (3:6, 2:6) | details | 01.08.2023 |
Germany: Hamburg - Singles - Main |
| 1/8-finals | Fils A. | Lajovic D. | 2:0 (7:5, 7:5) | details | 27.07.2023 |