Stadium: Court 3 Round: 14 Ground: Clay
| ITF - M15 Monastir | 2021/05/18 08:30 | Thomas Fancutt v Guido Ivan Justo | 6-2,6-4 |
| ITF - M15 Monastir | 2021/05/10 08:00 | Guido Ivan Justo v Francois Musitelli | 6-3,4-6,5-10 |
| ITF - M15 Monastir | 2021/05/05 08:25 | Guido Ivan Justo v Takashi Saito | 1-6,1-6 |
| 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 - M25 Lima | 2021/10/14 16:30 | Federico Zeballos v Gilbert S K Junior | 6-2,3-6,4-6 |
| ITF - M25 Lima | 2021/10/12 18:00 | Federico Zeballos v Enrique Bogo | 6-1,6-1 |
| ITF - M25 Lima | 2021/10/07 14:45 | Federico Zeballos v Wilson Leite | 2-6,6-2,6-7 |
| ITF - M25 Lima | 2021/10/06 18:10 | Federico Zeballos v Joao M Nusdeo | 6-0,4-6,6-2 |
| ITF - M25 Lima | 2021/10/04 17:30 | Federico Zeballos v Ignacio A B Otarola | 6-0,6-1 |
| Challenger - Lima | 2021/09/27 15:00 | Nicolas Barrientos v Federico Zeballos | 7-5,6-1 |
| Challenger - Lima | 2021/09/26 17:30 | Federico Zeballos v Evan King | 4-6,6-2,6-3 |
| ITF - M25 Oviedo | 2021/08/31 10:00 | Johan Nikles v Federico Zeballos | 7-6,6-2 |