Stadium: Court 6 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Helsinki | 2021/05/31 08:30 | Pierre Delage v Oskar Antinheimo | 6-7,7-5,8-10 |
| ITF M15 Kouvola | 2021/05/25 08:30 | Karl Kiur Saar v Oskar Antinheimo | 6-3,6-0 |
| ITF M15 Pajulahti | 2019/09/18 12:20 | Naoki Tajima v Oskar Antinheimo | 6-2,6-1 |
| ITF M15 Helsinki | 2019/08/21 10:55 | Oskar Antinheimo v Patrik Niklas-Salminen | 2-6,2-6 |
| ITF M15 Helsinki | 2021/05/31 10:00 | Otto Leikola v Roni Mikael Hietaranta | 1-6,0-6 |
| ITF M15 Kouvola | 2021/05/26 14:40 | Luca Castelnuovo v Roni Mikael Hietaranta | 6-3,4-6,6-3 |
| ITF M15 Kouvola | 2021/05/25 08:30 | Roni Mikael Hietaranta v Jussi Salmio | 6-1,6-1 |
| ITF M15 Parnu | 2020/11/04 08:00 | Mattias Siimar v Roni Mikael Hietaranta | 6-3,6-2 |
| ITF M15 Parnu | 2020/11/02 11:00 | Roni Mikael Hietaranta v Adrien Burdet | 5-7,6-2,13-11 |
| ITF M15 Parnu | 2019/10/30 12:25 | Lasse Muscheites v Roni Mikael Hietaranta | 6-4,6-1 |
| ITF M15 Parnu | 2019/10/29 08:00 | Roni Mikael Hietaranta v Marcus Mansson | 2-6,7-6,10-4 |
| ITF M15 Pajulahti | 2019/09/18 12:30 | Yanki Erel v Roni Mikael Hietaranta | 6-0,6-2 |