Stadium: Court 6 Round: 27 Ground: Hardcourt outdoor
| ITF M15 Kouvola | 2021/05/27 11:25 | Luca Castelnuovo v Simonas Zukauskas | 6-1,6-3 |
| ITF M15 Kouvola | 2021/05/26 14:40 | Luca Castelnuovo v Roni Mikael Hietaranta | 6-3,4-6,6-3 |
| ITF M15 Tbilisi | 2021/05/18 07:00 | Yurii Dzhavakian v Luca Castelnuovo | 7-6,0-6,7-6 |
| ITF M15 Jerusalem | 2021/05/12 08:15 | Edan Leshem v Luca Castelnuovo | 7-5,7-5 |
| ITF M15 Ramat Hasharon | 2021/05/06 07:00 | Zane Khan v Luca Castelnuovo | 6-3,6-2 |
| ITF M15 Ramat Hasharon | 2021/05/05 11:05 | Gilad Tamar v Luca Castelnuovo | 6-7,4-6 |
| ITF M15 New Delhi | 2021/03/31 05:30 | S D Prajwal Dev v Luca Castelnuovo | 4-6,3-6 |
| ITF M15 Indore | 2021/03/12 04:00 | Aidan Mchugh v Luca Castelnuovo | 6-2,6-2 |
| 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 LPD Gran Canaria | 2021/04/27 08:55 | Naoki Tajima v Alex M Pujolras | 1-6,2-6 |