Stadium: Court 3 Round: 26 Ground: Hardcourt outdoor
| ITF M15 Almada | 2021/07/07 10:30 | Diego F Flores v Faria, Luis | 6-3,6-7,6-3 |
| ITF M25 Bakio | 2021/06/29 09:30 | Diego F Flores v Diaz Freire, Gabriel | 6-1,6-7,12-14 |
| UTR Pro Tennis Series Barcelona | 2021/06/13 10:00 | Diego F Flores v Miranda Cisneros, Jose Joaquin | 6-1,6-0 |
| UTR Pro Tennis Series Barcelona | 2021/06/12 08:30 | Martos Gornes, Sergio v Diego F Flores | 3-6,4-5 |
| UTR Pro Tennis Series Barcelona | 2021/06/11 08:00 | Alexandre Reco v Diego F Flores | 6-1,6-4 |
| UTR Pro Tennis Series Barcelona | 2021/06/10 11:00 | Marcelo Zormann v Diego F Flores | 7-6,6-4 |
| UTR Pro Tennis Series Barcelona | 2021/06/08 09:30 | Kuzey Cekirge v Diego F Flores | 2-6,6-1,6-5 |
| UTR Pro Tennis Series Barcelona | 2021/06/07 08:00 | Diego F Flores v Toledo Bague, Pol | 4-6,3-5 |
| ITF M15 Almada | 2021/07/07 08:30 | David Jorda Sanchis v Niki, Takuto | 2-6,2-6 |
| ITF - M15 Héraklion | 2021/06/09 11:10 | Cash, Julian v Niki, Takuto | 6-1,1-6,6-3 |
| ITF - M15 Héraklion | 2021/06/02 10:15 | Niki, Takuto v Zhang, Ze | 2-6,3-6 |
| ITF - M15 Héraklion | 2021/05/26 10:40 | Niki, Takuto v Federico Arnaboldi | 3-6,4-6 |
| ITF - M15 Héraklion | 2021/05/20 06:30 | Niki, Takuto v Zhang, Ze | 5-7,3-6 |
| ITF - M15 Héraklion | 2021/05/19 09:45 | Niki, Takuto v Mark Whitehouse | 6-3,6-3 |
| ITF - M15 Sharm El Sheikh | 2021/04/07 12:45 | Uzhylovsky, Vladimir v Niki, Takuto | 7-6,3-6,6-4 |
| ITF - M15 Sharm El Sheikh | 2021/04/01 09:25 | Niki, Takuto v Bega, Alessandro | 3-6,3-6 |