Stadium: Centre Court Round: 25 Ground: Clay
| ITF Brazil F2 | 2018/05/06 15:00 | Gonzalo Villanueva v Rafael Matos | 1-6,3-6 |
| ITF Brazil F2 | 2018/05/06 15:00 | Gonzalo Villanueva v Rafael Matos | 1-6,3-6 |
| ITF Brazil F2 | 2018/05/05 18:05 | Gonzalo Villanueva v Oscar Jose Gutierrez | 6-7,6-3,6-3 |
| 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 Qual | 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 |
| ITF Brazil F2 | 2018/05/06 15:00 | Gonzalo Villanueva v Rafael Matos | 1-6,3-6 |
| ITF Brazil F2 | 2018/05/05 16:00 | Igor Marcondes v Rafael Matos | 4-6,4-6 |
| ITF Brazil F2 | 2018/05/02 22:45 | Andre Miele v Rafael Matos | 3-6,3-6 |
| ITF Brazil F2 | 2018/05/01 16:15 | Augusto Laranja v Rafael Matos | 2-6,7-6,3-6 |
| ITF Brazil F1 | 2018/04/27 17:20 | Rafael Matos v Thiago Seyboth Wild | 2-6,6-7 |
| ITF Brazil F1 | 2018/04/26 15:30 | Rafael Matos v Carlos E. Severino | 7-5,6-2 |
| ITF Brazil F1 | 2018/04/24 14:40 | Rafael Matos v Augusto Laranja | 6-3,6-1 |
| ITF Turkey F11 | 2018/03/23 08:00 | Rafael Matos v Genaro Alberto Olivieri | 1-6,4-6 |