Stadium: Court 1 Round: 25 Ground: Clay
| Challenger Glasgow Qual | 2018/04/29 15:00 | Harri Heliovaara v Adrien Bossel | 2-6,7-6,6-4 |
| ITF Estonia F4 | 2017/11/08 13:00 | Adrien Bossel v Harri Heliovaara | 6-7,6-7 |
| Challenger Jinan | 2018/08/09 10:40 | Harri Heliovaara v Denis Yevseyev | 2-6,4-6 |
| Challenger Jinan | 2018/08/07 07:30 | Ramkumar Ramanathan v Harri Heliovaara | 3-6,4-6 |
| Challenger Chengdu | 2018/07/31 04:35 | Akira Santillan v Harri Heliovaara | 6-7,7-5,7-6 |
| Challenger Tampere | 2018/07/24 16:00 | Harri Heliovaara v Antoine Hoang | 0-6,4-6 |
| ITF Netherlands F2 | 2018/07/07 16:05 | Harri Heliovaara v Jelle Sels | 6-4,4-6,4-6 |
| ITF Netherlands F2 | 2018/07/06 12:15 | Harri Heliovaara v Denis Klok | 3-1 |
| ITF Netherlands F2 | 2018/07/05 08:00 | Harri Heliovaara v Stephan Gerritsen | 6-2,7-5 |
| ITF Netherlands F2 | 2018/07/04 08:00 | Harri Heliovaara v Kevin Kaczynski | 6-3,6-1 |
| ITF Switzerland F4 | 2018/08/28 15:15 | Adrien Bossel v Florent Bax | 1-6,6-7 |
| ITF Switzerland F3 | 2018/08/23 15:30 | Jacopo Berrettini v Adrien Bossel | 7-5,5-7,6-3 |
| ITF Switzerland F3 | 2018/08/22 11:30 | Adrien Bossel v Lucas Gomez | 7-6,6-7,6-3 |
| Challenger Lisbon Qual | 2018/05/12 13:00 | Adrien Bossel v Alejandro Davidovich Fokina | 1-6,1-6 |
| Challenger Glasgow Qual | 2018/04/29 15:00 | Harri Heliovaara v Adrien Bossel | 2-6,7-6,6-4 |
| Challenger Glasgow Qual | 2018/04/28 13:00 | Connor Thomson v Adrien Bossel | 3-6,4-6 |
| ITF Spain F10 | 2018/04/26 09:00 | Adrien Bossel v Fabien Reboul | 1-6,3-6 |
| ITF Spain F10 Qual | 2018/04/23 11:20 | Adrien Bossel v Benjamin Winter Lopez | 6-4,6-2 |