Barcelona beat FC Porto 2-0 in the 2011 edition of the UEFA Super Cup.
UEFA Super Cup game, is usually a tie between winner of European Champions League and UEFA cup. It is usually played on a neural ground to teams to determine which club is actually the overall European champion.
Watch match highlight between the two European champions:
http://www.youtube.com/v/vujN771RjZI?version=3&hl=en_US&rel=0