| ITF M15 Buenos Aires | 09/01 15:25 | 27 | Lautaro Midon v Daniel Vallejo | 6-3,6-4 | |
| ITF M15 Buenos Aires | 08/31 15:10 | 26 | Fermin Tenti v Daniel Vallejo | 3-6,6-4,3-6 | |
| ITF M15 Buenos Aires | 08/29 13:00 | 25 | Gonzalo Zeitune v Daniel Vallejo | 4-6,1-6 | |
| Challenger de Lima | 08/23 22:00 | 26 | Adolfo Daniel Vallejo v Ignacio Buse | 5-7,6-7 | |
| Challenger de Lima | 08/22 01:15 | 25 | [453] Adolfo Daniel Vallejo v Pedro Boscardin Dias [485] | 6-2,6-4 | |
| Challenger de Cary | 08/10 21:30 | 26 | [205] Tung-Lin Wu v Adolfo Daniel Vallejo [469] | 6-1,3-6,6-1 | |
| Challenger de Cary | 08/08 22:15 | 25 | [469] Adolfo Daniel Vallejo v Leandro Riedi [163] | 6-3,6-4 | |
| Challenger de Lexington | 08/03 23:05 | 26 | [204] Tung-Lin Wu v Adolfo Daniel Vallejo [484] | 6-4,7-6 | |
| Challenger de Lexington | 08/01 18:55 | 25 | [484] Adolfo Daniel Vallejo v Alex Bolt [315] | 6-4,4-6,6-1 | |
| Challenger de Salinas | 07/25 16:40 | 25 | [494] Adolfo Daniel Vallejo v Rio Noguchi [231] | 4-6,5-7 | |
| Challenger de Salinas | 07/24 16:45 | 19 | [494] Adolfo Daniel Vallejo v Calum Puttergill [181] | 6-3,6-1 | |
| Challenger de Salinas | 07/23 16:30 | 14 | Adolfo Daniel Vallejo v Miguel M Larrea | 6-1,6-0 | |
| Challenger de Santa Fe | 07/09 15:00 | 29 | Mariano Navone v Adolfo Daniel Vallejo | 6-2,6-4 | |
| Challenger de Santa Fe | 07/08 15:00 | 28 | Roman A Burruchaga v Adolfo Daniel Vallejo | 6-4,6-7,4-6 | |
| Challenger de Santa Fe | 07/07 13:00 | 27 | Adolfo Daniel Vallejo v Ignacio Monzon | 6-0,6-4 | |
| Challenger de Santa Fe | 07/05 15:15 | 26 | Matias Franco Descotte v Adolfo Daniel Vallejo | 6-3,4-6,1-6 | |
| Challenger de Santa Fe | 07/04 13:00 | 25 | Santiago De La Fuente v Adolfo Daniel Vallejo | 6-4,3-6,0-6 | |
| Challenger de Santa Fe | 07/03 16:10 | 19 | Adolfo Daniel Vallejo v Hernando J E Isnardi | 6-4,6-2 | |
| ITF M25 Rosario | 07/02 14:00 | 29 | Daniel Vallejo v Juan Ignacio Londero | 3-6,2-6 | |
| ITF M25 Rosario | 07/01 15:15 | 28 | Daniel Vallejo v Tomas Farjat | 6-3,6-2 | |
| ITF M25 Rosario | 06/30 13:00 | 27 | Lucas Catarina v Daniel Vallejo | 6-3,4-6,0-6 | |
| ITF M25 Rosario | 06/29 13:00 | 26 | Agustin Mastri v Daniel Vallejo | 2-6,4-6 | |
| ITF M25 Rosario | 06/28 13:00 | 25 | Joaquin Aguillar Cardozo v Daniel Vallejo | 1-6,6-7 | |
| Copa Davis | 06/24 21:15 | 2 | Juan C P Angelo v Daniel Vallejo | 6-7,6-7 | |
| Copa Davis | 06/23 19:15 | 2 | Peter Bertran v Adolfo Daniel Vallejo | 2-6,2-6 | |
| Copa Davis | 06/21 18:45 | 2 | Adolfo Daniel Vallejo v Alejandro Obando Maldonado | 6-1,6-3 | |
| Copa Davis | 06/20 20:35 | 2 | Adolfo Daniel Vallejo v Kevin Major | 6-4,6-4 | |
| Copa Davis | 06/19 20:35 | 2 | Adolfo Daniel Vallejo v Jesse Flores | 6-4,6-2 | |
| ITF M25 La Nucía | 06/01 08:55 | 25 | Daniel Vallejo v Jorge Martinez Martinez | 2-6,1-6 | |
| ITF M25 Mataró | 05/26 12:45 | 27 | Daniel Vallejo v Nikolas S Izquierdo | 1-6,1-6 |