Good grief that's appalling from Cristian Tello. A few minutes after wasting a clear chance, he puts in an even worse shot from an even better chance. Thiago Alcantara, who's been pretty quiet today, slips Tello through on goal, and he has plenty of time to steady himself and slip past Iker Casillas. Instead he hits the ball first time and belts his shot into row Z. Does he realise that Barcelona are losing here? That was pathetic.
That said, Barcelona are enjoying a spell of pressure here and it wouldn't be a huge shock if one of their attacks was able to break down Real Madrid before this game is up. They're going to have to be a little bit more direct, though - they have half an hour to get a goal or see their dreams of retaining the title go up in smoke.
We have live game coverage in our Barcelona vs. Real Madrid, 2012 El Clasico StoryStream. For more on the two teams, head over to Real Madrid blog Managing Madrid and FC Barcelona blog Barca Blaugranes.