Stadium: Court 5 Round: 29 Ground: Hardcourt outdoor
| ITF M15 Kouvola | 2021/05/29 07:00 | Alessandro Bega v Anton Matusevich | 4-6,4-6 |
| ITF M15 Kouvola | 2021/05/28 07:15 | Anton Matusevich v Zsombor Velcz | 6-1,6-3 |
| ITF M15 Kouvola | 2021/05/27 11:00 | Anton Matusevich v Oscar Weightman | 6-0,6-4 |
| ITF M15 Kouvola | 2021/05/26 06:00 | Anton Matusevich v Bekkhan Atlangeriev | 6-2,6-3 |
| UK Pro League | 2021/04/11 13:30 | Anton Matusevich v Henry Patten | 7-5,6-1 |
| UK Pro League | 2021/04/10 16:00 | Anton Matusevich v George Houghton | 7-5,7-5 |
| UK Pro League | 2021/04/09 11:30 | Anton Matusevich v Lui Maxted | 6-4,6-4 |
| UK Pro League | 2021/04/08 09:00 | Anton Matusevich v Tom Hands | 6-0,6-3 |
| ITF M15 Kouvola | 2021/05/29 07:00 | Naoki Tajima v Lorenzo Rottoli | 7-5,6-4 |
| 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 |