Stadium: Central Round: 25
| 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 | Dragos Nicolae Madaras v Alexander Weis | 6-3,6-0 |
| ITF M25 Sierre | 2021/09/01 11:35 | Yannik Steinegger v Alexander Weis | 6-7,7-6,6-3 |
| ITF M25 Caslano | 2021/08/27 12:35 | Alexander Weis v Calvin Hemery | 2-6,4-6 |
| ITF M25 Caslano | 2021/08/26 10:10 | Nicholas David Ionel v Alexander Weis | 3-6,3-6 |
| Challenger Murcia | 2021/09/26 09:00 | Emilio Nava v Daniel Merida Aguilar | 6-3,6-2 |
| ITF M15 Melilla | 2021/09/24 09:00 | Daniel Merida Aguilar v Oscar Mesquida Berg | 7-5,3-6,3-6 |
| ITF M25 Santander | 2021/08/24 09:00 | Rio Noguchi v Daniel Merida Aguilar | 6-0,6-2 |
| ITF M15 Xativa | 2021/08/04 14:55 | Miguel Damas v Daniel Merida Aguilar | 4-6,6-3,7-5 |
| ITF M25 Gandia | 2021/07/23 09:40 | Javier Barranco Cosano v Daniel Merida Aguilar | 6-1,6-3 |
| ITF M25 Gandia | 2021/07/22 16:00 | Daniel Merida Aguilar v Carlos Lopez Montagud | 6-4,6-1 |
| ITF M25 Gandia | 2021/07/20 14:30 | Daniel Merida Aguilar v Samuel M Arjona | 6-3,6-1 |
| ITF M15 Marbella | 2021/05/27 07:30 | Antoine Bellier v Daniel Merida Aguilar | 6-3,6-2 |