Stadium: Cancha 5 Round: 25 Ground: Clay
| Challenger Prague | 2018/07/27 11:00 | Aleksandr Nedovyesov v Guilherme Clezar | 6-4,7-6 |
| Challenger Prague | 2018/07/26 12:35 | Guilherme Clezar v Tim Van Rijthoven | 6-3,6-7,6-4 |
| Challenger Prague | 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 |
| ITF Ecuador F1 | 2018/07/24 20:35 | Kento Tagashira v Emilio Gomez | 1-6,1-6 |
| ITF China F11 Qual | 2018/07/14 01:00 | Owen Lu v Kento Tagashira | 6-3,6-2 |
| ITF Guam F1 | 2018/06/17 01:00 | Jeremy Sonkin v Kento Tagashira | 6-1,6-1 |
| ITF Japan F8 | 2018/06/09 01:00 | Takuya Kumasaka v Kento Tagashira | 7-6,6-0 |
| ITF China F8 | 2018/06/05 03:40 | Wishaya Trongcharoenchaikul v Kento Tagashira | 6-1,6-2 |
| ITF China F8 Qual | 2018/06/03 02:00 | Lewei Cai v Kento Tagashira | 1-6,2-6 |
| ITF Tunisia F20 | 2018/05/19 09:00 | Kento Tagashira v James Ibrahim | 4-6,6-7 |
| ITF Tunisia F18 | 2018/05/08 09:00 | Mustafa Ibraimi v Kento Tagashira | 6-4,6-3 |