Stadium: Quadra Guga Kuerten Round: 26
| ATP Buenos Aires Qual | 2018/02/11 16:00 | Rogerio Dutra Silva v Guilherme Clezar | 7-6,7-6 |
| ATP Buenos Aires Qual | 2018/02/10 14:00 | Guilherme Clezar v Renzo Olivo | 7-5,6-0 |
| ATP Quito Qual | 2018/02/03 16:00 | Gonzalo Escobar v Guilherme Clezar | 6-7,7-6,6-4 |
| Challenger Newport Beach | 2018/01/22 19:55 | Guilherme Clezar v Stefan Kozlov | 2-6,3-6 |
| Challenger Rio De Janeiro | 2017/11/24 19:00 | Carlos Berlocq v Guilherme Clezar | 7-5,6-1 |
| Challenger Rio De Janeiro | 2017/11/23 14:00 | Christian Lindell v Guilherme Clezar | 3-6,0-6 |
| Challenger Rio De Janeiro | 2017/11/21 18:00 | Guilherme Clezar v Goncalo Oliveira | 3-6,6-3,6-3 |
| Challenger Santiago 2 | 2017/11/14 22:00 | Guilherme Clezar v Gonzalo Lama | 4-6,6-2,3-6 |
| ATP Buenos Aires Qual | 2018/02/10 19:40 | Hernan Casanova v Alessandro Giannessi | 7-6,6-4 |
| ATP Quito | 2018/02/08 19:30 | Thiago Monteiro v Alessandro Giannessi | 7-6,4-6,7-5 |
| ATP Quito | 2018/02/07 17:00 | Alessandro Giannessi v Peter Polansky | 6-3,6-4 |
| ATP Quito Qual | 2018/02/04 18:35 | Alessandro Giannessi v Federico Gaio | 6-3,6-7,6-7 |
| ATP Quito Qual | 2018/02/03 18:10 | Alessandro Giannessi v Juan Ignacio Londero | 6-4,6-4 |
| Australian Open Qual | 2018/01/12 04:35 | Ernesto Escobedo v Alessandro Giannessi | 6-3,6-2 |
| Australian Open Qual | 2018/01/10 08:20 | Alessandro Giannessi v Sumit Nagal | 7-6,3-6,6-3 |
| Challenger Bratislava | 2017/11/06 19:20 | Mikhail Kukushkin v Alessandro Giannessi | 6-0,6-2 |