Stadium: Court 1 Round: 27 Ground: Clay
| Challenger Concepcion | 2021/02/14 16:00 | Guido Ivan Justo v Mariano Kestelboim | 3-6,6-4,3-6 |
| ITF M15 Olavarria | 2023/09/07 17:30 | Alejo Lorenzo Lingua Lavallen v Mariano Kestelboim | 3-6,2-6 |
| ITF M15 Olavarria | 2023/09/06 15:15 | Lucio Ratti v Mariano Kestelboim | 3-6,2-6 |
| ITF M15 Buenos Aires | 2023/08/30 17:05 | Mariano Kestelboim v Gilbert S K Junior | 2-6,2-6 |
| ITF M25 Santander | 2023/08/23 10:00 | Mariano Kestelboim v Carlos Sanchez Jover | 3-6,6-3,4-6 |
| ITF M25 Koksijde | 2023/08/17 13:55 | Mariano Kestelboim v Constantin Bittoun Kouzmine | 6-4,6-2 |
| ITF M25 Koksijde | 2023/08/15 12:35 | Thiemo De Bakker v Mariano Kestelboim | 3-6,3-6 |
| ITF M15 Eupen | 2023/08/09 10:30 | Mariano Kestelboim v Simon Beaupain | 6-7,5-7 |
| ITF M15 Bergamo | 2023/07/02 08:30 | Mariano Kestelboim v Inaki Montes-De La Torre | 3-6,6-4,5-7 |
| ITF M15 Olavarria | 2023/09/07 17:30 | Thiago Cigarran v Guido Ivan Justo | 1-6,3-6 |
| ITF M15 Olavarria | 2023/09/06 14:50 | Ignacio Carou v Guido Ivan Justo | 2-6,1-6 |
| Challenger Lima | 2023/08/22 18:45 | Guido Ivan Justo v Pedro Sakamoto | 4-6,6-7 |
| Challenger Lima | 2023/08/21 15:00 | Guido Ivan Justo v Alejandro H Franco | 0-6,6-2,6-1 |
| Challenger Lima | 2023/08/20 15:00 | Guido Ivan Justo v Noah Schachter | 6-7,6-3,6-3 |
| ITF M15 Belem | 2023/08/16 17:00 | Guido Ivan Justo v Pedro Rodrigues | 1-6,2-6 |
| ITF M15 Arequipa | 2023/08/12 17:00 | Alvaro G Meza v Guido Ivan Justo | 6-4,6-3 |
| ITF M15 Arequipa | 2023/08/11 21:00 | Daniel Antonio Nunez v Guido Ivan Justo | 6-7,4-6 |