Stadium: Quadra 5 Round: 25 Ground: Clay
| ITF Peru F3 | 2018/10/11 15:00 | Gonzalo Villanueva v Guido Ivan Justo | 6-0,6-0 |
| ITF Peru F2 | 2018/10/04 17:00 | Guido Ivan Justo v Gonzalo Villanueva | 4-6,1-6 |
| ITF Argentina F6 | 2018/09/19 14:45 | Gonzalo Villanueva v Guido Ivan Justo | 6-1,6-4 |
| Challenger Vina del Mar | 2023/03/14 17:25 | Andrea Pellegrino v Gonzalo Villanueva | 6-0,6-2 |
| Challenger Vina del Mar | 2023/03/13 14:00 | Gonzalo Villanueva v Wilson Leite | 3-6,3-6 |
| Challenger Vina del Mar | 2023/03/12 13:00 | Gonzalo Villanueva v Bor Artnak | 6-7,6-4,6-2 |
| Challenger Santiago | 2023/03/07 18:55 | Gonzalo Villanueva v Hernan Casanova | 0-6,1-6 |
| Challenger Santiago | 2023/03/06 14:55 | Gonzalo Villanueva v Federico Gaio | 4-6,4-6 |
| Challenger Santiago | 2023/03/05 15:35 | Gonzalo Villanueva v Ignacio A B Otarola | 6-2,6-0 |
| ATP Acapulco | 2023/02/26 03:45 | Rubin Statham v Gonzalo Villanueva | 6-3,6-2 |
| ITF M25 Santo Domingo | 2023/02/24 14:00 | Kyle Seelig v Gonzalo Villanueva | 6-3,4-6,6-3 |
| Challenger Florianopolis | 2023/04/17 13:30 | Guido Ivan Justo v Conner Huertas Del Pino | 6-3,6-4 |
| Challenger Florianopolis | 2023/04/16 12:30 | Jorge Panta v Guido Ivan Justo | 5-7,3-6 |
| UTR Pro Tigre | 2023/04/02 12:00 | Guido Ivan Justo v Leonardo Aboian | 3-6,6-2,4-6 |
| UTR Pro Tigre | 2023/03/31 13:30 | Guido Ivan Justo v Federico Juan Aguilar | 1-6,3-6 |
| UTR Pro Tigre | 2023/03/30 12:00 | Guido Ivan Justo v Ramiro Amarilla | 3-6,3-6 |
| UTR Pro Tigre | 2023/03/29 13:30 | Pedro Boscardin Dias v Guido Ivan Justo | 7-6,6-3 |
| UTR Pro Tigre | 2023/03/28 16:01 | Lorenzo Gagliardo v Guido Ivan Justo | 6-3,6-1 |
| UTR Pro Tigre | 2023/03/26 18:51 | Tristan Boyer v Guido Ivan Justo | 3-6,6-4,6-3 |