Stadium: Court 2 Round: 27 Ground: Clay
| ITF M15 Madrid | 2021/10/28 09:30 | Vilius Gaubas v Vladislav Ivanov | 6-7,6-1,6-2 |
| ITF M15 Madrid | 2021/10/27 07:55 | Lilian Marmousez v Vilius Gaubas | 6-1,3-6,6-7 |
| Davis Cup | 2021/09/19 08:45 | Alexandros Skorilas v Vilius Gaubas | 6-4,6-4 |
| ITF M15 Parnu | 2021/08/04 10:15 | Mattias Siimar v Vilius Gaubas | 4-6,6-1,7-5 |
| ITF M15 Castelo Branco | 2021/07/27 08:30 | Vilius Gaubas v Gilbert S K Junior | 4-6,3-6 |
| ITF M15 Madrid | 2021/10/28 11:30 | Diego A B Sanchez v Aleksandre Metreveli | 6-1,6-3 |
| ITF M15 Madrid | 2021/10/26 09:30 | Diego A B Sanchez v Asier P D Zulueta | 6-3,6-1 |
| ITF M15 Girona | 2021/10/21 11:20 | Alexander Weis v Diego A B Sanchez | 6-4,6-4 |
| ITF M15 Girona | 2021/10/19 09:00 | Diego A B Sanchez v Alexis Musialek | 6-1,6-3 |
| Challenger Alicante | 2021/10/11 09:00 | Santiago Rodriguez Taverna v Diego A B Sanchez | 6-4,6-7,7-5 |
| Challenger Alicante | 2021/10/10 11:00 | Diego A B Sanchez v Wojciech Marek | 6-4,6-3 |
| ITF M15 Cairo | 2021/09/22 09:20 | Diego A B Sanchez v Edoardo Lavagno | 1-6,3-6 |
| ITF M15 Cairo | 2021/09/15 10:05 | Diego A B Sanchez v Stefano Battaglino | 1-6,4-6 |