USA: Miami - Singles - Main |
| 1/32-finals | Ruud C. | van Assche L. | 2:1 (7:65, 1:6, 6:1) | details | 23.03.2024 |
| 1/64-finals | Kotov P. | van Assche L. | 0:2 (3:6, 5:7) | details | 20.03.2024 |
USA: Phoenix - Singles - Main |
| Semi-finals | Borges N. | van Assche L. | 2:1 (6:4, 4:6, 6:2) | details | 16.03.2024 |
| Quarter-finals | Kudla D. | van Assche L. | 0:2 (3:6, 1:6) | details | 16.03.2024 |
| 1/8-finals | van Assche L. | Lestienne C. | 0:0 RET. (4:1) | details | 14.03.2024 |
| 1/16-finals | Garin C. | van Assche L. | 1:2 (6:2, 4:6, 4:6) | details | 13.03.2024 |
USA: Indian Wells - Singles - Main |
| 1/64-finals | van Assche L. | Arnaldi M. | 0:2 (66:7, 63:7) | details | 06.03.2024 |
United Arab Emirates: Dubai - Singles - Main |
| 1/16-finals | van Assche L. | Khachanov K. | 0:2 (2:6, 3:6) | details | 27.02.2024 |
United Arab Emirates: Dubai - Singles - Qualification |
| Final | van Assche L. | Marterer M. | 1:2 (7:5, 3:6, 4:6) | details | 25.02.2024 |
| Semi-finals | van Assche L. | Dougaz A. | 2:0 (7:63, 6:1) | details | 24.02.2024 |
Qatar: Doha - Singles - Qualification |
| Semi-finals | van Assche L. | Cressy M. | 0:2 (3:6, 2:6) | details | 17.02.2024 |
Netherlands: Rotterdam - Singles - Qualification |
| Semi-finals | van Assche L. | Brouwer G. | 0:2 (3:6, 3:6) | details | 10.02.2024 |
France: Marseille - Singles - Main |
| 1/16-finals | Ruusuvuori E. | van Assche L. | 2:0 (7:62, 6:4) | details | 07.02.2024 |
World: Davis Cup - World Group - Singles - Qualification |
| | Wu Tung-Lin | van Assche L. | CAN. | details | 04.02.2024 |
| | Hsu Y. H. | van Assche L. | 0:2 (4:6, 4:6) | details | 03.02.2024 |
Australia: Australian Open - Singles - Main |
| 1/16-finals | van Assche L. | Tsitsipas S. | 0:3 (3:6, 0:6, 4:6) | details | 19.01.2024 |
| 1/32-finals | Musetti L. | van Assche L. | 2:3 (3:6, 6:3, 7:65, 3:6, 0:6) | details | 17.01.2024 |
| 1/64-finals | Duckworth J. | van Assche L. | 2:3 (7:62, 3:6, 6:3, 3:6, 3:6) | details | 15.01.2024 |
New Zealand: Auckland - Singles - Main |
| 1/8-finals | van Assche L. | Norrie C. | 1:2 (3:6, 7:66, 1:6) | details | 10.01.2024 |
| 1/16-finals | Wolf J.J. | van Assche L. | 0:2 (4:6, 2:6) | details | 08.01.2024 |
New Zealand: Auckland - Singles - Qualification |
| Final | van Assche L. | Munar J. | 2:1 (3:6, 7:65, 6:2) | details | 07.01.2024 |
| Semi-finals | Sitak A. | van Assche L. | 0:2 (1:6, 1:6) | details | 06.01.2024 |
| Semi-finals | Garin C. | van Assche L. | CAN. | details | 06.01.2024 |
Australia: Brisbane - Singles - Main |
| 1/16-finals | van Assche L. | Shevchenko A. | 0:2 (3:6, 2:6) | details | 31.12.2023 |
World: Next Gen Finals - Jeddah - Play Offs |
| Semi-finals | Fils A. | van Assche L. | 3:1 (2:4, 4:1, 4:31, 4:36) | details | 01.12.2023 |
World: Next Gen Finals - Jeddah - Main |
| Group B | van Assche L. | Michelsen A. | 3:2 (4:30, 34:4, 34:4, 4:1, 4:36) | details | 30.11.2023 |
| Group B | van Assche L. | Medjedovic H. | 1:3 (2:4, 4:2, 37:4, 1:4) | details | 29.11.2023 |
| Group B | van Assche L. | Shelbayh A. | 3:1 (4:35, 35:4, 4:1, 4:1) | details | 28.11.2023 |
France: Metz - Singles - Main |
| Quarter-finals | van Assche L. | Herbert P. | 1:2 (6:4, 3:6, 5:7) | details | 09.11.2023 |
| 1/8-finals | Wawrinka S. | van Assche L. | 1:1 RET. (6:3, 66:7) | details | 08.11.2023 |
| 1/16-finals | van Assche L. | Van De Zandschulp B. | 2:1 (3:6, 6:3, 7:65) | details | 06.11.2023 |
France: Paris - Singles - Main |
| 1/32-finals | Djere L. | van Assche L. | 2:1 (66:7, 6:4, 6:4) | details | 30.10.2023 |
China: Shanghai - Singles - Main |
| 1/64-finals | Schwartzman D. | van Assche L. | 2:1 (5:7, 6:3, 6:2) | details | 05.10.2023 |
France: Orleans - Singles - Main |
| Semi-finals | Draper J. | van Assche L. | 2:0 (7:5, 6:3) | details | 30.09.2023 |
| Quarter-finals | Goffin D. | van Assche L. | 0:2 (4:6, 3:6) | details | 29.09.2023 |
| 1/8-finals | Nardi L. | van Assche L. | 1:2 (6:4, 62:7, 1:6) | details | 27.09.2023 |
| 1/16-finals | Molcan A. | van Assche L. | 1:2 (6:1, 62:7, 3:6) | details | 25.09.2023 |
USA: US Open - Singles - Main |
| 1/64-finals | Jarry N. | van Assche L. | 3:1 (6:3, 3:6, 6:2, 7:63) | details | 29.08.2023 |
USA: Winston-Salem - Singles - Main |
| 1/16-finals | Vukic A. | van Assche L. | 2:1 (6:3, 65:7, 6:3) | details | 22.08.2023 |
| 1/32-finals | van Assche L. | Kwiatkowski T. S. | 2:1 (3:6, 6:3, 6:2) | details | 22.08.2023 |
USA: Cincinnati - Singles - Qualification |
| Semi-finals | Purcell M. | van Assche L. | 2:1 (4:6, 6:3, 6:3) | details | 12.08.2023 |
Austria: Kitzbuhel - Singles - Main |
| 1/16-finals | van Assche L. | Molcan A. | 0:2 (4:6, 3:6) | details | 31.07.2023 |
Germany: Hamburg - Singles - Main |
| Quarter-finals | Zverev A. | van Assche L. | 2:0 (6:3, 6:4) | details | 28.07.2023 |
| 1/8-finals | van Assche L. | Davidovich Fokina A. | 2:1 (3:6, 7:65, 6:4) | details | 26.07.2023 |
| 1/16-finals | van Assche L. | Muller A. | 2:0 (7:63, 6:4) | details | 24.07.2023 |
Sweden: Bastad - Singles - Main |
| 1/8-finals | van Assche L. | Cerundolo F. | 0:2 (2:6, 3:6) | details | 19.07.2023 |
| 1/16-finals | Madaras N. | van Assche L. | 0:2 (62:7, 4:6) | details | 17.07.2023 |