Round: 44 Ground: Hardcourt outdoor
| ITF Portugal F6 Qual | 2018/03/24 13:00 | Antonio, Joao v Kaelin, Yanik | 1-6,3-6 |
| ITF Portugal F5 Qual | 2018/03/18 12:30 | Kaelin, Yanik v Rodrigues, Daniel | 4-6,2-6 |
| ITF Portugal F5 Qual | 2018/03/18 11:30 | Velloso, Joao Gabriel v Kaelin, Yanik | 0-6,1-6 |
| ITF Portugal F3 | 2018/03/07 10:00 | Boyer, Dusty H v Kaelin, Yanik | 6-3,6-4 |
| ITF Portugal F3 | 2018/03/05 13:00 | Hans Albert Schubert v Kaelin, Yanik | 2-6,4-6 |
| ITF Portugal F3 | 2018/03/05 10:00 | Laelson Rodrigues v Kaelin, Yanik | 3-6,0-6 |
| ITF Portugal F2 Qual | 2018/02/25 15:00 | Kaelin, Yanik v Ivan Marrero Curbelo | 3-6,2-6 |
| ITF Portugal F2 Qual | 2018/02/25 10:00 | Amatiste, Gianmarco v Kaelin, Yanik | 2-6,3-6 |
| ITF Spain F7 | 2018/03/19 09:30 | Briand, Jurgen v Chaix, Louis | 2-6,7-5,1-6 |
| ITF Spain F6 Qual | 2018/03/12 09:00 | Briand, Jurgen v Exposito, Adrian | 3-6,3-6 |
| ITF Spain F6 Qual | 2018/03/11 08:00 | Briand, Jurgen v Vicente O Moratalla | 6-0,6-1 |
| Turkey F8, Singles Qualifying | 2018/02/26 06:00 | Kenneth Raisma v Briand, Jurgen | 6-4,4-6,6-4 |
| ITF Turkey F7 | 2018/02/18 06:30 | Briand, Jurgen v Urbanija, Mike | 4-6,6-1,1-6 |
| Spain F4, Singles Qualifying | 2018/02/05 09:00 | Dzhanashia, Shalva v Briand, Jurgen | 3-6,3-6 |
| Spain F4, Singles Qualifying | 2018/02/04 09:00 | Briand, Jurgen v Schelcher Muro, Pablo | 6-4,6-3 |
| Spain F4, Singles Qualifying | 2018/02/03 14:30 | Briand, Jurgen v Alex M Pujolras | 6-2,6-0 |