Real Madrid were three ahead thansk to goals from Karim Benzema and Sergio Ramos, as well as a Cabral own goal, heading in to added time, with Hugo Mallo netting for Celta.
The away side were able to counter as Celta tries to push for a way back in to the game, and Dani Ceballos was able to make the most of Celta's lack of presence at the back when he picked the ball up and rifled one in to the top corner from 25 yards.
The game was out of sight from then, but the home side managed to get on back just three minutes later.
Brais Mendez found the ball at his feet after some pinball in the Real Madrid box, and his shot got a deflection off a defender and went in to the bottom-left corner of the net, but it was too little to late for the Galician side.