| UTR Pro Tennis Series Copenhagen | 2021/10/18 08:30 | Drew Van Orderlain v Adam Heinonen | 4-6,5-7 |
| ITF M25 Falun | 2021/09/26 08:00 | Sebastian Eriksson v Adam Heinonen | 6-2,4-6,12-10 |
| ITF M25 Jonkoping | 2021/09/20 07:30 | Arvid Nordquist v Adam Heinonen | 6-3,6-4 |
| ITF M15 Frederiksberg | 2021/08/02 08:50 | Adam Heinonen v Christopher Patzanovsky | 3-6,4-6 |
| ITF M15 Frederiksberg | 2021/08/01 08:00 | Adam Heinonen v Nikolaj Katic | 6-3,6-7,10-6 |
| ITF M15 Vejle | 2021/07/25 07:00 | Adam Heinonen v Philip Hjorth | 1-6,6-4,8-10 |
| ITF M15 Antalya | 2021/05/09 07:00 | Adam Heinonen v Riccardo Di Nocera | 3-6,6-2,2-10 |
| ITF M15 Antalya | 2021/05/02 06:00 | Adam Heinonen v Valentin Vanta | 3-6,6-3,6-10 |