Stadium: FCC Court Round: 25 Ground: Clay
| Challenger Almaty | 2018/06/12 05:20 | Goncalo Oliveira v Guilherme Clezar | 6-3,3-6,1-6 |
| Challenger Rio De Janeiro | 2017/11/21 18:00 | Guilherme Clezar v Goncalo Oliveira | 3-6,6-3,6-3 |
| Challenger Praha | 2018/07/24 12:40 | Yannick Maden v Goncalo Oliveira | 6-3,6-3 |
| Challenger Scheveningen | 2018/07/17 13:50 | Goncalo Oliveira v Oscar Otte | 6-7,2-6 |
| Challenger Bastad | 2018/07/11 11:10 | Corentin Moutet v Goncalo Oliveira | 6-4,3-6,6-2 |
| Challenger Bastad | 2018/07/09 10:45 | Goncalo Oliveira v Jonathan Mridha | 6-4,7-5 |
| Challenger Marburg Qual | 2018/07/01 10:25 | Goncalo Oliveira v Ronald Slobodchikov | 1-6,3-6 |
| Challenger Marburg Qual | 2018/06/30 15:10 | Goncalo Oliveira v Pawel Juszczak | 6-1,6-3 |
| Wimbledon Qual | 2018/06/25 11:40 | Goncalo Oliveira v Christian Harrison | 3-6,1-6 |
| Challenger Fergana | 2018/06/21 10:00 | Goncalo Oliveira v Cem Ilkel | 3-6,7-6,4-6 |
| Challenger Praha | 2018/07/27 11:00 | Aleksandr Nedovyesov v Guilherme Clezar | 6-4,7-6 |
| Challenger Praha | 2018/07/26 12:35 | Guilherme Clezar v Tim Van Rijthoven | 6-3,6-7,6-4 |
| Challenger Praha | 2018/07/25 10:40 | Guilherme Clezar v Daniel Brands | 6-3,6-1 |
| Wimbledon Qual | 2018/06/25 11:15 | Thomas Fabbiano v Guilherme Clezar | 6-2,6-3 |
| Challenger L'Aquila | 2018/06/23 13:00 | Facundo Bagnis v Guilherme Clezar | 6-3,5-7,7-6 |
| Challenger L'Aquila | 2018/06/22 13:00 | Guilherme Clezar v Gianluigi Quinzi | 6-3,1-6,7-6 |
| Challenger L'Aquila | 2018/06/20 10:05 | Martin Cuevas v Guilherme Clezar | 3-6,6-1,2-6 |
| Challenger L'Aquila | 2018/06/19 10:50 | Riccardo Bonadio v Guilherme Clezar | 4-6,5-7 |