Estádio: Centrale Round: 27 Ground: Clay
| Challenger de Vicenza | 2018/05/31 12:30 | Guilherme Clezar v Gianluigi Quinzi | 6-4,6-3 |
| Challenger - Buenos Aires | 2017/03/15 14:00 | Guilherme Clezar v Gianluigi Quinzi | 2-6,5-7 |
| Challenger - Caltanissetta | 2016/06/07 12:10 | Guilherme Clezar v Gianluigi Quinzi | 2-6,6-1,6-7 |
| 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 |
| Challenger - Almaty | 2018/06/14 05:00 | Guilherme Clezar v Yannick Hanfmann | 3-6,2-6 |
| Challenger - Almaty | 2018/06/13 07:55 | Nikola Milojevic v Guilherme Clezar | 2-6,6-3,1-6 |
| Challenger - Almaty | 2018/06/12 05:20 | Goncalo Oliveira v Guilherme Clezar | 6-3,3-6,1-6 |
| Challenger - Shymkent | 2018/06/05 04:00 | Tung-Lin Wu v Guilherme Clezar | 7-5,6-4 |
| Challenger de Vicenza | 2018/06/01 14:30 | Guilherme Clezar v Gian Marco Moroni | 3-6,2-6 |
| Challenger de Vicenza | 2018/05/31 12:30 | Guilherme Clezar v Gianluigi Quinzi | 6-4,6-3 |
| Challenger L'Aquila | 2018/06/21 08:00 | Benjamin Hassan v Gianluigi Quinzi | 3-6,4-6 |
| Challenger L'Aquila | 2018/06/18 17:00 | Roberto Quiroz v Gianluigi Quinzi | 2-6,4-6 |
| Challenger de Vicenza | 2018/05/31 12:30 | Guilherme Clezar v Gianluigi Quinzi | 6-4,6-3 |
| Challenger de Vicenza | 2018/05/30 09:00 | Gianluca Mager v Gianluigi Quinzi | 2-6,3-6 |
| Challenger - Mestre | 2018/05/27 13:00 | Gian Marco Moroni v Gianluigi Quinzi | 2-6,2-6 |
| Challenger - Mestre | 2018/05/26 11:00 | Gianluigi Quinzi v Danilo Petrovic | 6-2,7-6 |
| Challenger - Mestre | 2018/05/25 13:50 | Lorenzo Giustino v Gianluigi Quinzi | 6-2,6-7,3-6 |
| Challenger - Mestre | 2018/05/23 10:15 | Federico Gaio v Gianluigi Quinzi | 6-7,3-6 |