Real Madrid seemed to be on the way to an easy win after an excellent Benzema strike, before Cabral scored an unfortunate own-goal to make the score 2-0 to 'Los Blancos'.
Celta had looked dangerous on the counter-attack as the game went on, and proved that they could finish too thanks to Mallo's strike.
A wonderfully-clipped ball in to the box from the left flank proved to be the key to unlock the Madrid defence, with the on-rushing Mallo not being tracked in to the box.
With the ball coming down over his shoulder, the right-back struck it first time and in to the far corner of the net.