Stadium: Estadio Round: 24 Ground: Hardcourt outdoor
| Challenger Monterrey | 2018/09/30 16:00 | Manuel Sanchez v Gonzalo Escobar | 3-6,3-6 |
| Challenger Monterrey | 2018/09/29 16:00 | Jordi Arconada v Manuel Sanchez | 3-6,7-6,5-7 |
| Challenger San Benedetto Qual | 2018/07/14 11:20 | Juan Pablo Varillas v Manuel Sanchez | 6-1,7-6 |
| Challenger Recanati Qual | 2018/06/30 14:45 | Manuel Sanchez v Matej Sabanov | 0-6,5-7 |
| Challenger L'Aquila Qual | 2018/06/16 14:45 | Zhizhen Zhang v Manuel Sanchez | 7-5,6-2 |
| ITF Mexico F2 | 2018/05/15 18:45 | Manuel Sanchez v Federico Zeballos | 4-6,5-7 |
| ITF Mexico F2 | 2018/05/14 16:00 | Manuel Sanchez v Mauricio Resendiz Dominguez | 6-3,6-7,6-4 |
| ITF Mexico F2 | 2018/05/13 16:00 | Manuel Sanchez v Nicolas Bruna | 6-2,6-4 |
| Challenger Morelos | 2019/02/18 16:00 | Evan Furness v Gonzalo Villanueva | 6-2,6-7,1-6 |
| Challenger Punta del Este | 2019/01/23 14:00 | Gonzalo Villanueva v Nino Serdarusic | 6-7,6-4,4-6 |
| Challenger Punta del Este | 2019/01/21 14:00 | Thiago Seyboth Wild v Gonzalo Villanueva | 6-1,4-6,3-6 |
| Challenger Buenos Aires | 2018/11/13 19:50 | Gonzalo Villanueva v Hugo Dellien | 4-6,3-6 |
| Challenger Buenos Aires | 2018/11/12 14:00 | Manuel Pena Lopez v Gonzalo Villanueva | 3-6,6-3,1-6 |
| Challenger Buenos Aires | 2018/11/11 20:15 | Pedro Sakamoto v Gonzalo Villanueva | 5-7,6-4,2-6 |
| 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 |