Spain: Madrid - Singles - Main |
| 1/64-finals | Koepfer D. | Carballes Baena R. | 1:2 (1:6, 6:3, 65:7) | details | 25.04.2024 |
Germany: Munich - Singles - Main |
| 1/16-finals | Garin C. | Koepfer D. | 2:0 (7:63, 6:3) | details | 16.04.2024 |
Monaco: Monte Carlo - Singles - Main |
| 1/32-finals | Koepfer D. | Griekspoor T. | 1:2 (62:7, 6:4, 2:6) | details | 07.04.2024 |
Portugal: Estoril - Singles - Main |
| 1/16-finals | Koepfer D. | Llamas Ruiz P. | 0:2 (4:6, 3:6) | details | 03.04.2024 |
USA: Miami - Singles - Main |
| 1/8-finals | Koepfer D. | Medvedev D. | 0:2 (65:7, 0:6) | details | 26.03.2024 |
| 1/16-finals | Humbert U. | Koepfer D. | 1:2 (6:3, 4:6, 3:6) | details | 25.03.2024 |
| 1/32-finals | Koepfer D. | Baez S. | 2:0 (6:3, 6:2) | details | 23.03.2024 |
| 1/64-finals | Giron M. | Koepfer D. | 1:2 (6:4, 1:6, 4:6) | details | 21.03.2024 |
USA: Indian Wells - Singles - Main |
| 1/64-finals | Shevchenko A. | Koepfer D. | 2:1 (6:3, 1:6, 7:63) | details | 06.03.2024 |
Mexico: Acapulco - Singles - Main |
| Quarter-finals | Koepfer D. | Rune H. | 0:2 (62:7, 60:7) | details | 01.03.2024 |
| 1/8-finals | Tiafoe F. | Koepfer D. | 1:2 (4:6, 7:5, 1:6) | details | 29.02.2024 |
| 1/16-finals | Atmane T. | Koepfer D. | 1:2 (4:6, 6:4, 0:6) | details | 28.02.2024 |
| 1/16-finals | Norrie C. | Koepfer D. | CAN. | details | 27.02.2024 |
Mexico: Los Cabos - Singles - Main |
| 1/16-finals | Koepfer D. | Borges N. | 0:2 (62:7, 2:6) | details | 21.02.2024 |
USA: Delray Beach - Singles - Main |
| 1/16-finals | Koepfer D. | Borges N. | CAN. | details | 13.02.2024 |
USA: Dallas - Singles - Main |
| Quarter-finals | Koepfer D. | Paul T. | 0:2 (5:7, 3:6) | details | 09.02.2024 |
| 1/8-finals | Koepfer D. | Hijikata R. | 2:0 (6:3, 7:65) | details | 08.02.2024 |
| 1/16-finals | Koepfer D. | Kovacevic A. | 2:0 (6:4, 7:65) | details | 07.02.2024 |
World: Davis Cup - World Group - Singles - Qualification |
| | Fucsovics M. | Koepfer D. | CAN. | details | 03.02.2024 |
| | Marozsan F. | Koepfer D. | 0:2 (2:6, 64:7) | details | 02.02.2024 |
Australia: Australian Open - Singles - Main |
| 1/64-finals | Zverev A. | Koepfer D. | 3:1 (4:6, 6:3, 7:63, 6:3) | details | 16.01.2024 |
Australia: Canberra - Singles - Main |
| Final | Koepfer D. | Mensik J. | 2:0 (6:3, 6:2) | details | 06.01.2024 |
| Semi-finals | Koepfer D. | Diallo G. | 2:1 (65:7, 7:5, 6:3) | details | 05.01.2024 |
| Quarter-finals | Koepfer D. | Goffin D. | 2:0 (7:65, 6:3) | details | 04.01.2024 |
| 1/8-finals | Koepfer D. | Vavassori A. | 2:0 (6:4, 6:4) | details | 03.01.2024 |
| 1/16-finals | Koepfer D. | Svajda Z. | 2:0 (6:2, 6:4) | details | 02.01.2024 |
Canada: Drummondville - Singles - Main |
| Quarter-finals | Koepfer D. | Bergs Z. | 1:2 (4:6, 6:4, 5:7) | details | 17.11.2023 |
| 1/8-finals | Koepfer D. | Pieczkowski O. | 2:0 (6:4, 6:4) | details | 17.11.2023 |
| 1/16-finals | Koepfer D. | Wiedenmann L. | 2:1 (5:7, 6:2, 6:2) | details | 15.11.2023 |
Canada: Calgary - Singles - Main |
| Final | Koepfer D. | Draxl L. | 0:2 (4:6, 3:6) | details | 13.11.2023 |
| Semi-finals | Koepfer D. | Diallo G. | WO. | details | 11.11.2023 |
| Quarter-finals | Koepfer D. | Bergs Z. | 2:0 (6:1, 6:3) | details | 10.11.2023 |
| 1/8-finals | Koepfer D. | Chidekh C. | 2:0 (6:3, 6:3) | details | 09.11.2023 |
| 1/16-finals | Koepfer D. | Broom C. | 2:0 (6:2, 6:3) | details | 07.11.2023 |
France: Paris - Singles - Qualification |
| Semi-finals | Koepfer D. | Giron M. | 0:2 (65:7, 3:6) | details | 28.10.2023 |
Switzerland: Basel - Singles - Qualification |
| Final | Hassan B. | Koepfer D. | 2:1 (6:2, 2:6, 6:4) | details | 22.10.2023 |
| Semi-finals | Nagal S. | Koepfer D. | 1:2 (6:3, 1:6, 63:7) | details | 21.10.2023 |
Belgium: Antwerp - Singles - Main |
| 1/16-finals | Borges N. | Koepfer D. | 2:0 (7:66, 6:4) | details | 18.10.2023 |
USA: US Open - Singles - Main |
| 1/64-finals | Alcaraz C. | Koepfer D. | 1:0 RET. (6:2, 3:2) | details | 30.08.2023 |
USA: Winston-Salem - Singles - Main |
| 1/8-finals | Lehecka J. | Koepfer D. | 2:1 (6:3, 3:6, 6:4) | details | 24.08.2023 |