Stadium: Center Court Round: 28 Ground: Clay
| ITF Argentina F8 | 2014/09/09 13:00 | Gonzalo Villanueva v Oscar Jose Gutierrez | 1-6,7-6,6-4 |
| ITF Brazil F3 | 2014/04/21 14:00 | Oscar Jose Gutierrez v Gonzalo Villanueva | 6-0,6-3 |
| ITF Brazil F2 | 2018/05/04 17:30 | Marcelo Zormann v Gonzalo Villanueva | 6-4,6-7,5-7 |
| ITF Brazil F2 | 2018/05/01 18:40 | Gonzalo Villanueva v Tomas Martin Etcheverry | 5-7,6-3,7-6 |
| ITF Brazil F1 | 2018/04/25 15:30 | Daniel Dutra Da Silva v Gonzalo Villanueva | 7-5,7-6 |
| ITF Brazil F1 | 2018/04/23 14:00 | Christian Oliveira v Gonzalo Villanueva | 7-5,3-6,0-6 |
| Challenger Santiago - kvalifikace | 2018/03/03 13:00 | Jose Hernandez-Fernandez v Gonzalo Villanueva | 7-6,7-6 |
| Challenger Punta Del Este Qual | 2018/02/26 14:30 | Juan Ignacio Galarza v Gonzalo Villanueva | 6-3,6-2 |
| Challenger Punta Del Este Qual | 2018/02/25 16:20 | Franco Agamenone v Gonzalo Villanueva | 1-6,3-6 |
| Challenger Punta Del Este Qual | 2018/02/24 19:40 | Gonzalo Villanueva v Gonzalo Lama | 7-5,3-6,6-2 |
| ITF Brazil F2 | 2018/05/05 00:25 | Oscar Jose Gutierrez v Pedro Sakamoto | 6-3,2-6,6-3 |
| ITF Brazil F2 | 2018/05/02 18:10 | Oscar Jose Gutierrez v Joao Lucas Reis da Silva | 6-4,6-3 |
| ITF Brazil F2 | 2018/05/01 15:00 | Oscar Jose Gutierrez v Fernando Yamacita | 6-4,6-0 |
| ITF Brazil F1 | 2018/04/27 17:00 | Camilo Ugo Carabelli v Oscar Jose Gutierrez | 4-6,6-3,6-1 |
| ITF Brazil F1 | 2018/04/25 15:30 | Alexandre Tsuchiya v Oscar Jose Gutierrez | 4-6,7-6,2-6 |
| ITF Brazil F1 | 2018/04/23 19:15 | Igor Marcondes v Oscar Jose Gutierrez | 6-2,2-6,3-6 |
| ITF Turkey F12 | 2018/03/29 13:00 | Oscar Jose Gutierrez v Dimitar Kuzmanov | 3-6,1-6 |
| ITF Turkey F12 | 2018/03/28 08:40 | Marvin Netuschil v Oscar Jose Gutierrez | 4-6,0-6 |