 Guatemala: M15 Guatemala - Singles - Main |
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| 1/16-finals | Raquin L. | Guilleme J. | 2:0 (7:5, 6:2) | details | 06.11.2024 |
 USA: M15 Winston-Salem, NC - Singles - Main |
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| 1/16-finals | Guilleme J. | Thomson M. | 0:2 (2:6, 2:6) | details | 15.10.2024 |
| USA: US Open - Singles - Qualification |
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| Final | Guilleme J. | Petkovic M. | 1:2 (7:62, 0:6, 6:10) | details | 30.08.2024 |
| Semi-finals | Kohlmann E. | Guilleme J. | 0:2 (3:6, 2:6) | details | 29.08.2024 |
 United Kingdom: Wimbledon - Singles - Qualification |
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| Semi-finals | Mazdrashki A. | Guilleme J. | 2:1 (64:7, 7:61, 10:7) | details | 04.07.2024 |
 France: French Open - Singles - Qualification |
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| Final | Robertson C. | Guilleme J. | 2:0 (7:5, 6:2) | details | 31.05.2024 |
| Semi-finals | Guilleme J. | Trifi A. | 2:1 (3:6, 6:2, 7:5) | details | 30.05.2024 |
 Australia: Australian Open - Singles - Qualification |
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| Semi-finals | Mazdrashki A. | Guilleme J. | 2:0 (7:63, 6:2) | details | 17.01.2024 |
 World: Davis Cup - Group IV - Singles - Placement matches |
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| 5th place | Maginley J. | Guilleme J. | 0:2 (4:6, 3:6) | details | 06.08.2022 |
| World: Davis Cup - Group IV - Singles - Main |
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| | Sydow P. | Guilleme J. | 0:2 (3:6, 2:6) | details | 05.08.2022 |
| | Turino O. | Guilleme J. | 1:2 (3:6, 6:3, 2:6) | details | 03.08.2022 |
| | Del Olmo T. | Guilleme J. | 1:2 (6:3, 0:6, 3:6) | details | 02.08.2022 |
