Stadium: Court 2 Round: 25 Ground: Clay
| Challenger Mestre Qual | 2018/05/20 08:30 | Thiemo De Bakker v Edoardo Eremin | 4-6,1-6 |
| Challenger Mestre Qual | 2018/05/19 10:25 | Thiemo De Bakker v Romain Barbosa | 6-1,6-4 |
| ITF Italy F3 | 2018/03/15 14:15 | Thiemo De Bakker v Ergi Kirkin | 3-6,4-6 |
| ITF Italy F3 | 2018/03/14 13:00 | Thiemo De Bakker v Bogdan Ionut Apostol | 6-4,2-6,6-1 |
| ITF Italy F2 | 2018/03/10 17:00 | Thiemo De Bakker v Attila Balazs | 6-2,5-7,6-1 |
| ITF Italy F2 | 2018/03/10 11:00 | Sumit Nagal v Thiemo De Bakker | 3-6,3-6 |
| ITF Italy F2 | 2018/03/09 15:45 | Billy Harris v Thiemo De Bakker | 5-7,3-6 |
| ITF Italy F2 | 2018/03/09 12:00 | Georg Winkler v Thiemo De Bakker | 2-6,1-6 |
| ITF Spain F14 | 2018/06/06 10:00 | Joao Monteiro v Niels Desein | 6-2,4-6,0-6 |
| ITF Spain F14 | 2018/06/05 11:55 | Joao Monteiro v Fred Simonsson | 6-2,6-1 |
| 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 |