| Challenger Porto | 08/24 09:00 | 14 | [248] Adam Heinonen v Alex Martinez [448] | 6-7,2-6 | |
| ITF M15 Bastad | 08/21 08:15 | - | Adam Heinonen v Nikola Slavic | 6-2,4-6,6-7 | |
| ITF M25 Gentofte | 07/30 10:17 | - | [227] Adam Heinonen v Aristotelis Thanos [458] | 0-6,6-2,2-6 | |
| ITF M25 Varnamo | 06/11 09:32 | - | Carl Emil Overbeck v Adam Heinonen | 5-7,6-1,6-4 | |
| Challenger Oeiras | 05/11 14:15 | 14 | [238] Adam Heinonen v Eero Vasa [383] | 6-7,6-7 | |
| Challenger Hersonissos | 03/02 13:00 | 14 | Henri Haupt v Adam Heinonen | 7-5,6-1 | |
| ITF M25 Faro | 02/26 10:00 | - |
[304] Adam Heinonen v
Marko Topo
[398] 
|
2-6,0-6 | |
| ITF M25 Faro | 02/24 10:00 | - | [304] Adam Heinonen v Szymon Kielan [276] | 6-4,6-3 | |
| Challenger Glasgow | 02/16 16:25 | 14 | [383] Giles Hussey v Adam Heinonen [315] | 6-2,3-6,6-2 | |
| ITF M25 Nussloch | 01/23 14:04 | - | [400] Justin Engel v Adam Heinonen [369] | 7-6,4-6,6-4 | |
| ITF M25 Nussloch | 01/20 13:39 | - | Adam Heinonen v Mika Petkovic | 6-4,6-3 | |
| ITF M15 Oslo | 01/09 11:00 | - | Tibo Colson v Adam Heinonen | 7-6,6-0 | |
| ITF M15 Oslo | 01/08 11:30 | - | Tomasz Berkieta v Adam Heinonen | 5-7,6-2,3-6 | |
| ITF M25 Heraklion | 11/07 08:00 | 26 |
Gauthier Onclin
v
Adam Heinonen |
6-4,6-1 | |
| ITF M25 Heraklion | 11/06 08:00 | 25 | Adam Heinonen v Christos Glavas | 6-1,6-3 | |
| ITF M25 Heraklion | 10/30 14:20 | 25 | [454] Adam Heinonen v Jacopo Berrettini [329] | 3-6,1-6 | |
| ITF M25 Heraklion | 10/29 11:25 | 44 | Adam Heinonen v Pablo Masjuan Ginel | 4-6,6-0,14-12 | |
| ITF M25 Heraklion | 10/28 10:30 | 44 | Adam Heinonen v Evangelos Kypriotis | 6-3,6-0 | |
| ITF M25 Heraklion | 10/25 07:00 | 27 |
[450] Adam Heinonen v
Marko Topo
[456]
|
3-6,3-6 | |
| ITF M25 Heraklion | 10/24 08:50 | 26 | [450] Adam Heinonen v Szymon Kielan [384] | 4-6,6-0,7-5 | |
| ITF M25 Heraklion | 10/23 11:00 | 25 | [299] Jakub Nicod v Adam Heinonen [450] | 2-6,1-6 | |
| ITF M25 Heraklion | 10/22 06:25 | 44 | Adam Heinonen v Vit Kalina | Retired | |
| ITF M25 Falun | 09/23 13:25 | 25 | Adam Heinonen v Christian Sigsgaard | 6-7,1-6 | |
| ITF M15 Vaxjo | 09/18 16:55 | 25 |
Adam Heinonen v
Lucas Renard
|
2-6,4-6 | |
| ITF M15 Ystad | 08/16 10:00 | 27 | Louis Wessels v Adam Heinonen | 7-6,6-3 | |
| ITF M15 Ystad | 08/15 08:55 | 26 | Christian Sigsgaard v Adam Heinonen | 5-7,6-3,2-6 | |
| ITF M15 Ystad | 08/14 10:25 | 25 | Stijn Paardekooper v Adam Heinonen | 5-7,0-6 | |
| ITF M15 Vaasa | 08/07 14:50 | 25 | Christopher Bulus v Adam Heinonen | 6-3,6-1 | |
| ITF M25 Kramsach | 07/24 12:30 | 25 |
Adam Heinonen v
Rangers U20
|
6-1,5-7,4-6 | |
| ITF M25 Aarhus | 06/14 09:00 | 27 |
Adam Heinonen v
August Holmgren
|
6-7,3-6 |
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