Stadium: Court 5 Round: 28 Ground: Hardcourt outdoor
| ITF M15 - Kouvola | 2021/05/28 07:15 | Luca Castelnuovo v Naoki Tajima | 3-6,2-6 |
| ITF M15 - Kouvola | 2021/05/27 08:30 | Aleksi Lofman v Naoki Tajima | 6-3,6-7,4-6 |
| ITF M15 - Kouvola | 2021/05/26 08:55 | Leevi Saatela v Naoki Tajima | 4-6,2-6 |
| ITF M15 - Sibenik | 2021/05/20 10:45 | Naoki Tajima v Dan Added | 1-6,4-6 |
| ITF M15 - Sibenik | 2021/05/19 15:05 | Bozo Barun v Naoki Tajima | 6-7,1-6 |
| ITF M15 - Prijedor | 2021/05/11 14:35 | Naoki Tajima v Miljan Zekic | 6-7,4-6 |
| ITF M15 - Majadahonda | 2021/05/03 12:00 | Naoki Tajima v Giovanni Mpetshi Perricard | 6-3,2-6,8-10 |
| ITF M15 - Majadahonda | 2021/05/02 16:15 | Naoki Tajima v Hugo Pontico | 7-6,6-0 |
| ITF M15 - Kouvola | 2021/05/28 08:35 | Lorenzo Rottoli v Otto Virtanen | 6-2,2-6,7-5 |
| ITF M15 - Kouvola | 2021/05/27 07:00 | Lorenzo Rottoli v Eero Vasa | 6-3,6-1 |
| ITF M15 - Kouvola | 2021/05/26 08:00 | Vladimir Ivanov v Lorenzo Rottoli | 2-6,4-6 |
| ITF M15 - Kouvola | 2021/05/25 10:00 | Lorenzo Rottoli v Peetu Pohjola | 7-6,6-2 |
| ITF M15 - Tbilisi | 2021/05/20 06:00 | Alessandro Bega v Lorenzo Rottoli | 6-1,6-0 |
| ITF M15 - Tbilisi | 2021/05/18 12:25 | Lorenzo Rottoli v George Tsivadze | 7-6,6-4 |
| ITF M15 - Sharm El Sheikh | 2021/04/06 09:40 | Daniel Cox v Lorenzo Rottoli | 7-5,6-3 |
| ITF M15 - Sharm El Sheikh | 2021/04/05 10:00 | Lorenzo Rottoli v Lukas Palovic | 6-3,6-1 |