Stadium: Court 1 Round: 26
| Challenger Mestre | 2018/05/24 10:25 | Joao Monteiro v Mitchell Krueger | 6-7,3-6 |
| Challenger Mestre | 2018/05/23 14:35 | Joao Monteiro v Mario Vilella Martinez | 7-5,6-7,6-1 |
| Challenger Lisbon | 2018/05/15 13:10 | Taro Daniel v Joao Monteiro | 7-6,7-6 |
| Challenger Braga | 2018/05/07 12:20 | Joao Monteiro v Gleb Sakharov | 6-2,3-6,2-6 |
| ATP Estoril Qual | 2018/04/30 13:45 | Ricardo Ojeda Lara v Joao Monteiro | 6-3,2-6,6-3 |
| ATP Estoril Qual | 2018/04/29 12:35 | Joao Monteiro v Stephane Robert | 6-3,6-7,7-6 |
| ITF Portugal F8 | 2018/04/20 12:40 | Joao Monteiro v Tiago Cacao | 4-6,5-7 |
| ITF Portugal F8 | 2018/04/19 13:05 | Joao Monteiro v Niels Desein | 6-2,6-7,6-4 |
| ITF Hungary F3 Qual | 2018/05/21 08:00 | Nick Cmager v Tim Van Der Horst | 6-4,6-0 |
| ITF Hungary F3 Qual | 2018/05/20 08:00 | Pelle Boerma v Tim Van Der Horst | 1-6,3-6 |
| ITF Hungary F2 Qual | 2018/05/13 08:00 | Mihnea L.S. Turcu v Tim Van Der Horst | 7-6,6-3 |
| ITF Hungary F2 Qual | 2018/05/12 08:00 | Daniel Cozma v Tim Van Der Horst | 3-6,6-7 |
| ITF Poland F2 | 2018/05/06 08:00 | David Damian Brna v Tim Van Der Horst | 4-6,6-3,6-3 |
| ITF Poland F1 | 2018/04/29 07:00 | Antonin Bolardt v Tim Van Der Horst | 7-6,6-3 |
| ITF Portugal F4 | 2018/03/11 11:30 | Tim Van Der Horst v Andres F Canovas | 1-6,1-6 |
| ITF Portugal F4 | 2018/03/10 11:00 | Tim Van Der Horst v Pelle Boerma | 6-2,6-3 |