Stadium: Court 5 Round: 44 Ground: Hardcourt outdoor
| ITF M15 Marbella | 2021/05/23 08:00 | Diego F Flores v Ignacio B Alia | 6-2,6-2 |
| ITF M25 Vic | 2021/05/17 08:00 | Laurent Lokoli v Diego F Flores | 7-6,7-6 |
| ITF M25 Vic | 2021/05/16 07:00 | Roman Andres Burruchaga v Diego F Flores | 5-7,3-6 |
| ITF M15 Valldoreix | 2021/05/10 08:00 | Diego F Flores v Oleg Prihodko | 1-6,6-4,11-13 |
| ITF M15 Valldoreix | 2021/05/09 12:00 | Diego F Flores v Juan Ignacio Alcalde | 6-1,6-3 |
| ITF M15 Majadahonda | 2021/05/02 13:15 | Juan Bautista Otegui v Diego F Flores | 6-3,6-4 |
| ITF M15 LPD Gran Canaria | 2021/04/28 11:25 | Alexander Weis v Diego F Flores | 0-6,6-2,6-3 |
| ITF M25 Reus | 2021/04/11 07:00 | Xavi Matas Ortega v Diego F Flores | 6-7,6-2,10-6 |
| ITF M15 Marbella | 2021/05/23 08:00 | Jim Walder v Lluc Mir Anglada | 6-3,7-5 |
| ITF M15 Troisdorf | 2021/05/09 10:00 | Jim Walder v Tim Riedel | 5-7,1-6 |
| ITF M25 Meerbusch | 2021/04/12 12:00 | Jim Walder v Paul Woerner | 3-6,5-7 |
| ITF M25 Meerbusch | 2021/04/12 07:30 | Jimmy Yang v Jim Walder | 2-6,3-6 |
| ITF M15 Antalya | 2021/03/14 07:00 | Jim Walder v Ivan Zaytsev | 4-6,2-6 |
| ITF M15 Antalya | 2021/03/07 07:00 | Jim Walder v Federico Campana | 6-1,2-6,13-15 |
| ITF M15 Antalya | 2021/02/28 11:00 | Radu Mihai Papoe v Jim Walder | 6-2,6-4 |
| ITF M15 Antalya | 2021/02/02 07:00 | Oleksii Krutykh v Jim Walder | 4-6,6-3,10-5 |