Stadium: Center South Round: 45
| Challenger Tiburon | 2018/09/22 21:55 | Renzo Olivo v Heliovaara, Harri | 6-2,3-6,7-6 |
| Coupe Davis | 2018/09/15 09:40 | Mohamed Safwat v Heliovaara, Harri | 6-2,6-4 |
| Coupe Davis | 2018/09/14 11:25 | Karim-Mohamed Maamoun v Heliovaara, Harri | 3-6,2-6 |
| ITF Switzerland F5 | 2018/09/07 11:00 | Heliovaara, Harri v Louis Wessels | 6-1,4-6,1-6 |
| ITF Switzerland F5 | 2018/09/06 11:00 | Heliovaara, Harri v Alexander Ritschard | 7-6,6-2 |
| ITF Switzerland F5 | 2018/09/05 12:40 | Heliovaara, Harri v Fallert, Florian | 4-6,6-3,6-3 |
| ITF Switzerland F5 | 2018/09/03 15:45 | Heliovaara, Harri v Bossel, Adrien | 6-3,6-0 |
| Jinan, China | 2018/08/09 10:40 | Heliovaara, Harri v Denis Yevseyev | 2-6,4-6 |
| Challenger Columbus | 2018/09/15 15:20 | Fawcett, Tom v Roelofse, Ruan | 6-3,6-4 |
| Challenger Cary | 2018/09/08 15:20 | Sarkissian, Alexander v Roelofse, Ruan | 6-4,6-3 |
| Challenger Chicago | 2018/09/05 17:00 | Tommy Paul v Roelofse, Ruan | 6-3,6-2 |
| Challenger Chicago | 2018/09/03 22:20 | Roelofse, Ruan v Sarkissian, Alexander | 3-6,4-6 |
| Challenger Chicago | 2018/09/02 22:10 | Gonzalez, Alejandro v Roelofse, Ruan | 4-6,6-3,3-6 |
| Challenger Chicago | 2018/09/02 17:45 | Fawcett, Tom v Roelofse, Ruan | 5-7,4-6 |
| Vancouver, Canada | 2018/08/11 18:20 | Roelofse, Ruan v Grills, Jacob | 1-6,2-6 |
| Challenger Aptos | 2018/08/04 17:20 | Roelofse, Ruan v Alex Rybakov | 3-6,6-7 |