Stadium: Court 4 Round: 25 Ground: Clay
| Challenger Blois | 2018/06/21 09:00 | Pedro Cachin v Heliovaara, Harri | 6-7,7-6,6-2 |
| Challenger Blois | 2018/06/19 16:00 | Frederico Ferreira Silva v Heliovaara, Harri | 6-3,5-7,6-7 |
| Challenger Blois Qual | 2018/06/18 10:15 | Heliovaara, Harri v Tristan Lamasine | 4-6,4-6 |
| Challenger Blois Qual | 2018/06/17 13:55 | Heliovaara, Harri v Arneodo, Romain | 4-6,7-6,7-6 |
| Challenger Blois Qual | 2018/06/16 15:45 | Heliovaara, Harri v Hach Verdugo, Hans | 6-1,6-4 |
| Challenger Lyon Qual | 2018/06/09 14:00 | Matteo Martineau v Heliovaara, Harri | 6-4,6-1 |
| Shymkent, Kazakhstan, Qualifying | 2018/06/02 07:00 | Heliovaara, Harri v Tung-Lin Wu | 6-7,3-6 |
| ITF China F5 | 2018/05/13 03:00 | Rigele Te v Heliovaara, Harri | 7-5,6-4 |
| ITF Netherlands F2 Qual | 2018/07/02 12:20 | Kaczynski, Kevin v Wagemaker, Pascal Juraj | 6-2,6-2 |
| ITF Germany F5 | 2018/06/25 11:30 | Kaczynski, Kevin v Fabian Marozsan | 3-6,2-6 |
| ITF Germany F5 | 2018/06/25 08:00 | Kaczynski, Kevin v Miles, Lewis | 6-2,6-4 |
| ITF South Africa F3 | 2017/12/05 10:30 | Kaczynski, Kevin v Peter Heller | 7-5,2-6,2-6 |
| South Africa F2, Singles | 2017/11/29 07:30 | Kaczynski, Kevin v Mitjana, Leny | 6-7,3-6 |
| Afrique du Sud F2, Qualifications Simples | 2017/11/26 13:50 | Kaczynski, Kevin v Klopper, Joubert | 6-4,2-6,6-3 |
| ITF South Africa F1 | 2017/11/22 17:05 | Kaczynski, Kevin v Du Toit, Lance-Pierre | 1-6,4-6 |
| ITF South Africa F1 Qual | 2017/11/20 11:00 | Kaczynski, Kevin v Longwe-Smit, Thando | 6-3,6-3 |