Stadium: Court 14 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Heraklion | 2023/10/24 06:30 | Niels Visker v Adam Heinonen | 6-4,3-6,6-10 |
| ITF - M15 Heraklion | 2023/10/23 10:30 | Piotr Siekanowicz v Adam Heinonen | 2-6,4-6 |
| ITF - M15 Heraklion | 2023/10/17 06:30 | Adam Heinonen v Ki Lung NG | 5-7,4-6 |
| ITF - M25 Falun | 2023/09/26 12:00 | Adam Heinonen v Evgeny Karlovskiy | 6-7,1-6 |
| ITF - M25 Falun | 2023/09/25 08:00 | Adam Heinonen v Jack Karlsson Winstrand | 6-1,6-3 |
| ITF - M25 Falun | 2023/09/24 07:55 | Adam Heinonen v Linus Videhult | 6-3,6-3 |
| ITF - M15 Danderyd | 2023/09/19 12:00 | Adam Heinonen v Jakob Schnaitter | 2-6,2-6 |
| ITF - M25 Ystad | 2023/08/15 12:25 | Marvin Moeller v Adam Heinonen | 6-2,6-7,7-5 |
| ITF - M15 Heraklion | 2023/10/24 06:30 | Graham Maassen v Alessandro Spadola | 6-4,6-2 |
| ITF - M15 Heraklion | 2023/10/23 07:30 | Eero Vasa v Graham Maassen | 4-6,6-3,7-10 |
| ITF - M15 Heraklion | 2023/10/16 06:30 | Graham Maassen v Ki Lung NG | 2-6,4-6 |
| ITF - M15 Heraklion | 2023/10/15 07:00 | Stefan Cizelj-Zivkovic v Graham Maassen | 3-6,3-6 |
| ITF - M15 Lakewood | 2023/07/03 17:00 | Dominique Rolland v Graham Maassen | 6-4,6-2 |
| ITF - M15 South Bend | 2023/06/19 14:00 | Muzammil Murtaza v Graham Maassen | 7-6,7-5 |
| ITF - M15 Tabasco | 2023/05/23 19:30 | Christopher Bulus v Graham Maassen | 6-0,6-2 |
| ITF - M15 Tabasco | 2023/05/22 16:00 | Alexey Shtengelov v Graham Maassen | 3-6,3-6 |