Stadium: Court 1 Round: 26 Ground: Clay
| ITF M25 Oviedo | 2021/08/31 10:15 | Oscar Jose Gutierrez v Juan Bautista Torres | 6-3,6-4 |
| ITF M25 Santander | 2021/08/27 10:30 | Imanol L Morillo v Oscar Jose Gutierrez | 6-3,6-3 |
| ITF M25 Santander | 2021/08/26 09:00 | Andrey Chepelev v Oscar Jose Gutierrez | 3-6,5-7 |
| ITF M25 Santander | 2021/08/24 10:15 | Kuzey Cekirge v Oscar Jose Gutierrez | 7-5,2-6,1-6 |
| ITF M25 Muttenz | 2021/08/20 11:00 | Jerome Kym v Oscar Jose Gutierrez | 4-6,6-2,6-3 |
| ITF M25 Muttenz | 2021/08/19 10:35 | Luca Castelnuovo v Oscar Jose Gutierrez | 1-6,2-6 |
| ITF M25 Muttenz | 2021/08/17 14:10 | Mateus Alves v Oscar Jose Gutierrez | 3-6,6-2,1-6 |
| Challenger San Marino | 2021/08/08 12:50 | Orlando Luz v Oscar Jose Gutierrez | 7-5,6-3 |
| ITF M25 Oviedo | 2021/08/31 06:55 | Miguel Fernando Pereira v Diego A B Sanchez | 1-6,7-6,3-6 |
| ITF M25 Oviedo | 2021/08/30 07:50 | Diego A B Sanchez v Mikel Martinez | 6-3,6-1 |
| ITF M25 Oviedo | 2021/08/29 08:00 | Diego A B Sanchez v Ignacio B Alia | 6-0,6-1 |
| ITF M25 Denia | 2021/07/28 09:55 | Nick Hardt v Diego A B Sanchez | 6-4,6-1 |
| ITF M15 Monastir | 2021/06/20 10:30 | Kody Pearson v Diego A B Sanchez | 6-7,6-1,11-9 |
| ITF M15 Monastir | 2021/06/13 14:00 | Giles Hussey v Diego A B Sanchez | 3-6,6-4,10-8 |
| ITF M25 Vic | 2021/05/17 09:00 | Diego A B Sanchez v Imanol L Morillo | 4-6,4-6 |
| ITF M25 Vic | 2021/05/16 08:00 | Diego A B Sanchez v Rishab Agarwal | 6-3,7-5 |