Stadium: Center Court Round: 46
| Challenger Stockton | 2018/09/29 20:30 | Heliovaara, Harri v Roelofse, Ruan | 7-6,6-1 |
| 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 |
| Challenger Stockton | 2018/09/29 19:20 | Sebastian Korda v Verbeek, Sem | 6-3,5-7,3-6 |
| ITF Portugal F16 | 2018/08/25 09:00 | Gil, Fred v Verbeek, Sem | 6-1,6-2 |
| ITF Portugal F16 | 2018/08/24 09:00 | Verbeek, Sem v Binding, Jonathan | 7-6,6-4 |
| ITF Portugal F16 | 2018/08/23 09:00 | Desein, Niels v Verbeek, Sem | 2-6,6-7 |
| ITF Portugal F16 | 2018/08/22 11:10 | Alves, Simao v Verbeek, Sem | 2-6,0-6 |
| Cordenons, Italy | 2018/08/11 10:15 | Trusendi, Walter v Verbeek, Sem | 6-1,6-2 |
| Challenger Winnipeg Qual | 2018/07/08 23:00 | Verbeek, Sem v Marc-Andrea Huesler | 6-7,4-6 |
| Challenger Winnipeg Qual | 2018/07/08 18:05 | Verbeek, Sem v Jumpei Yamasaki | 7-6,7-6 |