Barcelona dominated possession in the first period, but neither side could open the scoring despite a series of half-chances.
Madrid continued to press in the latter stages and finally had their goal through a powerful header from Raphael Varane.
Read how it all unfolded in Sports Mole's minute-by-minute live commentary of the action below.
REAL MADRID: Lopez; Essien, Varane, Carvalho, Arbeloa; Khedira, Alonso, Ozil; Callejon, Ronaldo, Benzema
BARCELONA: Pinto; Alves, Pique, Puyol, Alba; Xavi, Busquets, Fabregas; Pedro, Messi, Iniesta