Stadium: Pista 5 Round: 26 Ground: Clay
| ITF M15 Girona | 2021/10/19 09:00 | Alexander Weis v Manish Sureshkumar | 2-6,7-6,6-2 |
| Challenger Napoli Qual | 2021/10/10 14:00 | Alexander Weis v Filip Cristian Jianu | 3-6,6-4,3-6 |
| ITF M15 Platja D'Aro | 2021/10/05 10:45 | Alexander Weis v Merida Aguilar, Daniel | 4-6,3-6 |
| Challenger Murcia | 2021/09/26 13:30 | Corentin Denolly v Alexander Weis | 4-6,6-1,6-4 |
| ITF M25 Pardubice | 2021/09/25 09:40 | Henri Squire v Alexander Weis | 6-4,6-1 |
| ITF M25 Pardubice | 2021/09/23 10:30 | Alexander Weis v Toby Martin | 6-7,6-3,6-2 |
| ITF M25 Pardubice | 2021/09/22 08:00 | Alexander Weis v Mikalai Haliak | 7-6,6-4 |
| Challenger Banja Luka | 2021/09/05 11:05 | Madaras, Dragos Nicolae v Alexander Weis | 6-3,6-0 |
| ITF M15 Girona | 2021/10/19 09:00 | Diego A B Sanchez v Musialek, Alexis | 6-1,6-3 |
| Alicante, Spain | 2021/10/11 09:00 | Santiago Rodriguez Taverna v Diego A B Sanchez | 6-4,6-7,7-5 |
| Alicante, Spain | 2021/10/10 11:00 | Diego A B Sanchez v Marek, Wojciech | 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 Battaglino, Stefano | 1-6,4-6 |
| ITF M25 Oviedo | 2021/09/01 12:40 | Oscar Jose Gutierrez v Diego A B Sanchez | 6-3,7-5 |
| ITF M25 Oviedo | 2021/08/31 06:55 | Pereira, Miguel Fernando 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 |