Stadium: Court 2 Round: 54 Ground: Clay
| ITF M25 Frankfurt am Main | 2021/08/09 14:10 | Milan Welte v Taiyo Yamanaka | 6-7,4-6 |
| ITF M15 Novi Sad | 2021/08/02 11:00 | Ivailo Keremedchiev v Taiyo Yamanaka | 6-2,6-7,10-6 |
| ITF M15 Novi Sad | 2021/08/01 11:15 | Luka Kalenic v Taiyo Yamanaka | 0-6,1-6 |
| ITF M15 Novi Sad | 2021/07/25 07:00 | Stevan Popovic v Taiyo Yamanaka | 6-3,4-6,10-7 |
| ITF M25 Kottingbrunn | 2021/07/21 12:05 | Taiyo Yamanaka v Sandro Kopp | 1-6,2-6 |
| ITF M25 Kottingbrunn | 2021/07/20 07:55 | Taiyo Yamanaka v Benedikt Emesz | 7-6,5-7,8-10 |
| ITF M25 Kottingbrunn | 2021/07/19 08:00 | Taiyo Yamanaka v Michal Novansky | 7-5,4-6,11-9 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Taiyo Yamanaka v Leon Benedict | 6-4,6-1 |
| ITF M25 Frankfurt am Main | 2021/08/09 11:55 | Max Wiskandt v Niklas Schell | 6-3,3-6,5-10 |
| ITF M25 Marburg | 2021/07/07 13:00 | Louis Wessels v Niklas Schell | 6-3,6-4 |
| ITF M25 Klosters | 2021/06/20 08:55 | Ilias Zimmermann v Niklas Schell | 6-4,4-6,12-10 |
| ITF M15 Antalya | 2021/05/23 07:00 | Niklas Schell v Stefano D'Agostino | 4-6,6-3,7-10 |
| ITF M15 Troisdorf | 2021/05/09 08:00 | Marlon Vankan v Niklas Schell | 2-6,7-6,13-11 |
| ITF M15 Monastir | 2021/04/18 13:00 | Lilian Breut v Niklas Schell | 6-2,6-3 |
| ITF M15 Monastir | 2021/04/14 08:30 | Niklas Schell v Giorgio Ricca | 3-6,2-6 |
| ITF M15 Monastir | 2021/04/12 13:00 | Leyton Rivera v Niklas Schell | 4-6,7-6,8-10 |