| Challenger Chengdu | 07/31 03:25 | 25 | [282] Tung-Lin Wu v Harri Heliovaara [474] | 6-3,6-7,2-6 | |
| Challenger Chengdu | 07/30 02:00 | 24 | [474] Harri Heliovaara v Courtney John Lock [459] | 6-3,6-2 | |
| Challenger Tampere | 07/23 13:05 | 24 | Ivan Nedelko v Harri Heliovaara | 6-4,3-6,6-1 | |
| Challenger Columbus | 06/10 22:55 | 24 | [320] Zhizhen Zhang v Harri Heliovaara [440] | 6-3,6-4 | |
| Challenger Sarasota | 04/16 14:00 | 24 | [374] Harri Heliovaara v Guilherme Clezar [244] | 2-6,4-6 | |
| Challenger Sarasota | 04/15 14:00 | 166 | [374] Harri Heliovaara v Johannes Haerteis [373] | 6-3,6-2 | |
| Challenger Zhangjiagang | 03/19 03:05 | 24 | [256] Guilherme Clezar v Harri Heliovaara [376] | 7-6,6-3 | |
| Challenger Zhangjiagang | 03/18 02:00 | 166 | [374] Harri Heliovaara v Luca Margaroli [144] | 2-6,6-3,6-1 | |
| Challenger Zhuhai | 03/05 03:45 | 24 | [280] Yunseong Chung v Harri Heliovaara [374] | 7-5,6-2 | |
| Challenger Zhuhai | 03/04 02:00 | 166 | Harri Heliovaara v Haitong Xia | 6-1,6-4 | |
| Challenger Burnie | 01/21 01:25 | 24 | [435] Harry Bourchier v Harri Heliovaara [378] | Retired | |
| Challenger Champaign | 11/15 16:00 | 26 | Christopher Eubanks v Harri Heliovaara | Walkover | |
| Challenger Champaign | 11/13 16:00 | 25 | [348] Harri Heliovaara v Mikael Torpegaard [479] | 3-6,7-5,6-4 | |
| Challenger Charlottesville | 10/27 14:00 | 45 | [371] Marcos Giron v Harri Heliovaara [317] | 3-6,6-1,6-1 | |
| Challenger Stockton | 10/01 17:00 | 54 | [321] Harri Heliovaara v Alexander Sarkissian [328] | 6-4,4-6,4-6 | |
| Challenger Stockton | 09/30 19:35 | 46 | [323] Harri Heliovaara v Sem Verbeek [194] | 6-1,6-4 | |
| Challenger Stockton | 09/29 20:30 | 45 | [323] Harri Heliovaara v Ruan Roelofse [160] | 7-6,6-1 | |
| Challenger Tiburon | 09/22 21:55 | 45 | [349] Renzo Olivo v Harri Heliovaara [322] | 6-2,3-6,7-6 | |
| Davis Cup | 09/15 09:40 | 28 | [191] Mohamed Safwat v Harri Heliovaara [330] | 6-2,6-4 | |
| Davis Cup | 09/14 11:25 | 1 | [373] Karim-Mohamed Maamoun v Harri Heliovaara [330] | 3-6,2-6 | |
| ITF Switzerland F5 | 09/07 11:00 | 28 | [330] Harri Heliovaara v Louis Wessels [437] | 6-1,4-6,1-6 | |
| ITF Switzerland F5 | 09/06 11:00 | 27 | [330] Harri Heliovaara v Alexander Ritschard [490] | 7-6,6-2 | |
| ITF Switzerland F5 | 09/05 12:40 | 26 | Harri Heliovaara v Florian Fallert | 4-6,6-3,6-3 | |
| ITF Switzerland F5 | 09/03 15:45 | 25 | Harri Heliovaara v Adrien Bossel | 6-3,6-0 | |
| Challenger Jinan | 08/09 10:40 | 26 | [349] Harri Heliovaara v Denis Yevseyev [306] | 2-6,4-6 | |
| Challenger Jinan | 08/07 07:30 | 25 | [117] Ramkumar Ramanathan v Harri Heliovaara [349] | 3-6,4-6 | |
| Challenger Chengdu | 07/31 04:35 | 25 | [281] Akira Santillan v Harri Heliovaara [347] | 6-7,7-5,7-6 | |
| Challenger Tampere | 07/24 16:00 | 25 | [347] Harri Heliovaara v Antoine Hoang [220] | 0-6,4-6 | |
| ITF Netherlands F2 | 07/07 16:05 | 28 | [360] Harri Heliovaara v Jelle Sels [477] | 6-4,4-6,4-6 | |
| ITF Netherlands F2 | 07/06 12:15 | 27 | Harri Heliovaara v Denis Klok | 3-1 |