Round: 44 Ground: Clay
| ATP Houston | 2015/04/07 20:45 | Janko Tipsarevic v Guilherme Clezar | 6-4,3-6,7-6 |
| ATP Houston Qual | 2015/04/05 16:00 | Facundo Bagnis v Guilherme Clezar | 2-6,6-7 |
| ATP Houston Qual | 2015/04/04 15:00 | Guilherme Clezar v Sekou Bangoura | 7-6,7-6 |
| Challenger San Luis Potosi | 2015/04/02 20:10 | Guilherme Clezar v James McGee | 3-6,6-2,6-7 |
| Challenger San Luis Potosi | 2015/04/01 21:10 | Connor Smith v Guilherme Clezar | 2-6,5-7 |
| ATP Buenos Aires Qual | 2015/02/21 18:00 | Juan Ignacio Iliev v Guilherme Clezar | 1-6,0-6 |
| Challenger Guayaquil | 2014/11/12 01:40 | Renzo Olivo v Guilherme Clezar | 3-6,6-3,6-3 |
| Challenger Cali 2 | 2014/10/01 17:00 | Alejandro Gonzalez v Guilherme Clezar | 4-6,6-3,6-1 |
| ATP Houston Qual | 2015/04/05 20:00 | Mischa Zverev v Fabiano De Paula | 6-2,6-2 |
| ATP Houston Qual | 2015/04/04 19:15 | Alejandro Gonzalez v Mischa Zverev | 4-6,2-6 |
| ITF USA F1 | 2015/01/08 17:45 | Mischa Zverev v Nicolas Barrientos | 2-6,2-6 |
| ITF USA F1 | 2015/01/07 17:50 | Mischa Zverev v Arthur Surreaux | 6-1,3-6,6-2 |