Real Madrid may have taken more shots, and were the more aggressive club on Sunday, but European and La Liga champions Barcelona have the two away-goal advantage after holding their rivals to a 2-2 draw, with the second leg on Wednesday at Camp Nou.
Goakeeper Iker Casillas didn't make one save, as Barcelona was perfect in their two shots on goal, and on only four total shots. Such efficiency is very rare, so head coach Jose Mourinho will likely stick with the same strategy in the second leg. His squad may have put together their best performance against Barcelona since his his arrival in 2010.
Real Madrid has to go into Nou Camp confident that their effort in the first leg will carry over. Los Galacticos looked very fit, and were not thrown off by Barcelona's normally dizzying passing strategy.
Though Karim Benzema didn't score in the match, his assist to Mesut Ozil was a key play in the match. Cristiano Ronaldo also was on his game, and Mourinho got solid play from his defense, with the exception of Pepe's slip that resulted in Lionel Messi's goal before halftime.
Barcelona's Carles Puyol was sidelined for the first leg, and will be unavailable on Wednesday. The centre back's absence was very apparent, as Barcelona's defense lacked cohesion at many points of the match. Though Javier Mascherano did a solid job in central defense, Eric Abidal looked tentative.
The big question facing Pep Guardiola will be if he plans on playing new midfielder Cesc Fabregas, and if so, how many minutes. Fabregas trained with his new teammates on Monday, and is obviously well-acquainted with the squad from his time with the Spain National Team. However, he hasn't played with Arsenal in quite some time and a rusty performance might risk the match against an elite squad like Real Madrid.
Guardiola conceded that Barcelona had key players who were not match fit going into Sunday's first leg. Regular starters Xavi Hernandez, Gerard Pique, and Pedro came off the bench in the first leg. David Villa only played 73 minutes despite not receiving many touches in the match.
Should Barcelona receive better efforts from their starters, Real Madrid may be in for a long night in Camp Nou.