Stadium: Court 6 Round: 62 Ground: Clay
| ITF M15 Sibenik | 2021/05/16 07:30 | Benedikt Emesz v Jan Kupcic | 1-6,6-4,6-10 |
| ITF M15 Prijedor | 2021/05/10 08:00 | Rimpei Kawakami v Jan Kupcic | 6-0,7-5 |
| ITF M15 Prijedor | 2021/05/09 07:00 | Jan Kupcic v Petar Jovic | 6-2,6-0 |
| ITF M15 Sibenik | 2021/04/19 10:55 | Alen Rogic-Hadzalic v Jan Kupcic | 7-5,6-3 |
| ITF M15 Sibenik | 2021/04/18 13:00 | Jan Kupcic v Ivan Karlo Ban | 6-1,6-2 |
| ITF M15 Porec | 2021/03/09 10:35 | Samuel Brosset v Jan Kupcic | 6-2,6-2 |
| ITF M15 Porec | 2021/03/08 13:00 | Jan Kupcic v Maxime Mora | 6-1,7-5 |
| ITF M15 Porec | 2021/03/07 13:00 | Jan Kupcic v Alessandro Ragazzi | 6-4,6-0 |
| ITF M15 Valldoreix | 2021/05/09 14:00 | Taiyo Yamanaka v Xavi Matas Ortega | 5-7,6-4,4-10 |
| ITF M15 Majadahonda | 2021/05/03 12:00 | Luis Faria v Taiyo Yamanaka | 6-4,5-7,10-7 |
| ITF M15 Majadahonda | 2021/05/02 16:15 | Taiyo Yamanaka v Guy Den Heijer | 6-7,6-3,11-9 |
| ITF M15 Antalya | 2021/04/26 07:00 | Taiyo Yamanaka v Dan Alexandru Tomescu | 4-6,2-6 |
| ITF M15 Antalya | 2021/04/25 07:00 | Taiyo Yamanaka v Michel Hopp | 6-3,6-4 |
| ITF M15 Antalya | 2021/04/18 07:00 | Taiyo Yamanaka v Keisuke Saitoh | 4-6,1-6 |
| ITF M15 Antalya | 2021/04/13 08:15 | Taiyo Yamanaka v Antonio Massara | 2-6,6-4,12-14 |
| ITF M15 Antalya | 2021/04/12 09:00 | Aleksandre Bakshi v Taiyo Yamanaka | 3-6,0-6 |