Today's front-page headlines from Marca, AS and Mundo Deportivo.

Two teams that never give up

Sampaoli attempts a feat that no-one has ever managed, coming from 3 goals down to defeat Real Madrid

Madrid, a game away from 40 matches unbeaten

Zidane leaves Modric and Ronaldo in Madrid

Sampaoli includes everyone, includes new signings Jovetic and Lenglet

This works like this: great goal from Messi - magical free-kick sees Barca edge through

Alcorcon through to the quarters!

Tiago wanted to go to China and the club stopped him going

'The treble is an objective' - Zidane dares to say the taboo word

Both ambitious managers reserve players for Sunday

Sampaoli doesn't have Mariano, N'Zonzi, Vazquez, Real leave Ronaldo and Modric in Madrid

Messi lit the light - another great free-kick sees Barca win, competition opens two dossiers against Pique

Alcorcon make history as they make the quarters

Villarreal exit Copa

Alaves suffer but progress

City could have broken anti-doping rules - FA opens investigation

Triumphal reaction

Barca progress to quarters after Athletic game not suited for the faint-hearted

The trident all score for the first time since 17 September

Zidane without Ronaldo and Modric - also without injured Bale, James, Isco, but confident of progression

City accused of breaking anti-doping rules