| 1. Round | 17/12/2020 | CD Teruel | - | Rayo Vallecano | 2:3 aet | ||||
| 3. Round | 16/01/2021 | Rayo Vallecano | - | Elche CF | 2:0 | ||||
| Round of 16 | 27/01/2021 | Rayo Vallecano | - | FC Barcelona | 1:2 |
| 1. Round | 17/12/2020 | CD Teruel | - | Rayo Vallecano | 2:3 aet | ||||
| 3. Round | 16/01/2021 | Rayo Vallecano | - | Elche CF | 2:0 | ||||
| Round of 16 | 27/01/2021 | Rayo Vallecano | - | FC Barcelona | 1:2 |
| Mario Hernández Fernández | |
| Born: | 25.01.1999 |
| Place of birth: |
Madrid, 
Spain |
| Nationality: |
Spain
|
| Height: | 177 cm |
| Weight: | 75 kg |
| Position(s): | Right Back |
| Foot: | right |