Stadium: Cancha 8 Round: 46 Ground: Clay
| Challenger Buenos Aires | 2018/11/11 16:10 | Pedro Sakamoto v Tomas Farjat | 6-3,6-3 |
| Challenger Montevideo | 2018/11/03 13:00 | Pedro Sakamoto v Genaro Alberto Olivieri | 2-6,0-6 |
| Challenger Guayaquil Qual | 2018/10/27 16:00 | Pedro Sakamoto v Federico Zeballos | 6-1,6-7,2-6 |
| Challenger Lima | 2018/10/20 21:20 | Tomas Barrios Vera v Pedro Sakamoto | 6-4,6-3 |
| Challenger Campinas | 2018/09/30 13:00 | Nicolas Alvarez v Pedro Sakamoto | 6-3,7-6 |
| Challenger Campinas | 2018/09/29 13:55 | Guillermo Duran v Pedro Sakamoto | 1-6,2-6 |
| ITF Poland F8 | 2018/08/23 09:00 | Pedro Sakamoto v Petr Nouza | 3-6,3-6 |
| ITF Poland F8 | 2018/08/21 09:30 | Pedro Sakamoto v Michal Mikula | 6-3,6-2 |
| Challenger Montevideo | 2018/11/05 16:00 | Gonzalo Villanueva v Federico Coria | 5-7,1-6 |
| Challenger Montevideo | 2018/11/04 16:30 | Dragos Dima v Gonzalo Villanueva | 2-6,2-6 |
| Challenger Montevideo | 2018/11/03 14:30 | Nicolas Alvarez v Gonzalo Villanueva | 2-6,0-6 |
| Challenger Lima | 2018/10/21 15:00 | Bastian Malla v Gonzalo Villanueva | 7-5,6-2 |
| Challenger Lima | 2018/10/20 16:35 | Thiago Seyboth Wild v Gonzalo Villanueva | 4-6,6-4,0-6 |
| ITF Peru F3 | 2018/10/12 16:00 | Gonzalo Villanueva v Mariano Kestelboim | 5-7,7-6,3-6 |
| ITF Peru F3 | 2018/10/11 15:00 | Gonzalo Villanueva v Guido Ivan Justo | 6-0,6-0 |
| ITF Peru F3 | 2018/10/09 16:40 | Gonzalo Villanueva v Junior Alexander Ore | 6-3,6-4 |