| Challenger Guayaquil | 2015/11/03 17:35 | Guilherme Clezar v Guido Pella | 1-6,6-3,3-6 |
| Challenger Medellin | 2015/10/08 15:30 | Paolo Lorenzi v Guilherme Clezar | 7-6,6-4 |
| Challenger Medellin | 2015/10/05 16:00 | Yannik Reuter v Guilherme Clezar | 2-6,7-5,1-6 |
| Challenger Campinas | 2015/09/23 22:25 | Facundo Arguello v Guilherme Clezar | 6-3,6-7,6-4 |
| Challenger Campinas | 2015/09/21 21:35 | Christian Lindell v Guilherme Clezar | 7-5,3-6,4-6 |
| US Open Qual | 2015/08/28 18:15 | Guilherme Clezar v John-Patrick Smith | 3-6,2-6 |
| US Open Qual | 2015/08/27 21:20 | Nicolas Almagro v Guilherme Clezar | 6-7,6-4,4-6 |
| US Open Qual | 2015/08/26 16:40 | Amir Weintraub v Guilherme Clezar | 6-3,4-6,3-6 |