Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2021/04/28 08:30 | Yuta Kawahashi v Guido Ivan Justo | 6-4,6-2 |
| ITF M15 Cordoba | 2021/04/06 14:05 | Tomas Farjat v Guido Ivan Justo | 6-2,6-4 |
| ATP Acapulco | 2021/03/14 04:35 | Guido Ivan Justo v Agustin Velotti | 0-6,1-6 |
| ATP Cordoba | 2021/02/20 19:50 | Joao Menezes v Guido Ivan Justo | 6-3,7-6 |
| Challenger Concepcion | 2021/02/14 16:00 | Guido Ivan Justo v Mariano Kestelboim | 3-6,6-4,3-6 |
| ITF M15 Monastir | 2020/10/31 08:30 | Guido Ivan Justo v Skander Mansouri | 6-7,7-5,1-6 |
| ITF M15 Monastir | 2020/10/30 10:00 | Matias Franco Descotte v Guido Ivan Justo | 3-6,4-6 |
| ITF M15 Monastir | 2020/10/29 08:00 | Guido Ivan Justo v Tomas Lipovsek Puches | 6-4,1-6,6-2 |
| ITF M15 Monastir | 2021/05/04 08:00 | Takashi Saito v Marcello Serafini | 7-5,2-6,10-8 |
| ITF M15 Monastir | 2021/05/03 12:00 | Takashi Saito v Francesco Cano | 6-0,6-3 |
| ITF M15 Sharm El Sheikh | 2021/03/01 07:30 | Takashi Saito v Manuel Mazza | 4-6,3-6 |
| ITF M15 Sharm El Sheikh | 2021/02/24 07:30 | Takashi Saito v Yu Hsiou Hsu | 1-6,1-6 |
| ITF M15 Sharm El Sheikh | 2021/02/23 09:20 | Takashi Saito v Andres Gabriel Ciurletti | 7-5,6-1 |
| ITF M15 Sharm El Sheikh | 2021/02/21 15:30 | Takashi Saito v Emiliano Troche | 6-1,6-1 |
| ITF M15 Sharm El Sheikh | 2021/02/16 07:30 | Erik Crepaldi v Takashi Saito | 6-4,4-6,10-4 |
| ITF M15 Sharm El Sheikh | 2021/02/15 07:30 | Arvid Nordquist v Takashi Saito | 4-6,7-6,8-10 |