Barca coach Frank Rijkaard sprung something of a surprise when he named Ronaldinho and Deco in his starting 11 after a week of heated speculation.
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Although Barca dominated the ball early on, they were given little space to work their passes and Real had the first clear effort when Pepe headed straight at Victor Valdes from a Wesley Sneijder free kick.
Andres Iniesta sent Samuel Eto'o scampering into the area after 29 minutes but Iker Casillas was quick off his line to smother the danger and then poke the ball off the foot of Iniesta in the follow up.