Stadium: Court 3 Round: 54
| Challenger Stockton | 2018/09/30 19:35 | Heliovaara, Harri v Verbeek, Sem | 6-1,6-4 |
| 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 |
| Challenger Stockton | 2018/09/30 20:35 | Craig, Henry v Sarkissian, Alexander | 2-6,2-6 |
| Challenger Stockton | 2018/09/29 18:50 | Sebastian Fanselow v Sarkissian, Alexander | 6-7,3-6 |
| Challenger Tiburon | 2018/09/25 21:15 | Sarkissian, Alexander v James Duckworth | 6-7,4-6 |
| Challenger Tiburon | 2018/09/24 18:55 | Sarkissian, Alexander v Vivero Gonzalez, Pablo | 6-3,6-7,6-2 |
| Challenger Tiburon | 2018/09/23 19:20 | Mitchell Krueger v Sarkissian, Alexander | 2-6,4-6 |
| Challenger Tiburon | 2018/09/22 18:15 | Nielsen, Frederik v Sarkissian, Alexander | 4-6,5-7 |
| Challenger Cary | 2018/09/10 18:00 | Sarkissian, Alexander v Joris De Loore | 4-6,4-6 |
| Challenger Cary | 2018/09/09 14:00 | Sarkissian, Alexander v Schneider, Ronnie | 6-2,2-6,6-3 |