Cristiano Ronaldo picked himself up when Gerard Pique's foul to attain from the spot and Barca struggled to reply.
Lionel Messi curled simply wide however his aspect were caught short as Ronaldo sweptback home from Angel di Maria's shot.
Raphael Varane's precise header created it 3-0 on the night and Jordi Alba's neat end was very little consolation to Barca.
Trailing leaders urban center by sixteen points within the league, and with their Champions League campaign below threat against Manchester United next Tuesday, Real's probability to book their place within the Copa del Rey final against either metropolis or Atletico capital of Spain had taken on additional importance for under-pressure capital of Spain boss Jose Mourinho.
Shikoni Videon