David Villa marked his league debut for Barcelona with a goal as Pep Guardiola's side began the defence of their Primera Division title with a comfortable 3-0 win at Racing Santander.
Lionel Messi opened the scoring with a fine goal after just three minutes and Andres Iniesta added an even better second later in the half as the Spanish champions quickly took control at El Sardinero.
Racing striker Mohamed Tchite saw his penalty saved by Barca keeper Victor Valdes moments later and Villa had an effort ruled out for offside before the break.
But the Spain striker struck again after 62 minutes with a pinpoint header to score his first goal in Barca colours and ensure an ideal start to the league campaign for the Catalans.
Jose Mourinho had to settle for a point in his first league game in charge of Real Madrid after drawing a blank at Real Mallorca.
The visitors were largely uninspiring yet still created enough chances to have won comfortably with Gonzalo Higuain and Cristiano Ronaldo uncharacteristically wasteful in front of goal.
And with Mallorca goalkeeper Dudu Aouate turning in a wonderful display, there was no way through for Madrid's star-studded team.
Dani Osvaldo struck a brace and Jesus Datolo scored on his debut as Espanyol kicked off the season with a 3-1 win at home to Getafe.
Osvaldo struck either side of half-time to put the Barcelona side in control of the match and although an Ernesto Galan own-goal gave Getafe hope of salvaging a point, Datolo sealed the win for Espanyol with the clincher deep into added time.
Real Sociedad began life back in the Primera Division with a 1-0 win over Villarreal thanks to Xabi Prieto's second-half goal.
The Basque side were returning to the top flight following three years in the Second Division and fans' idol Prieto ensured the club rejoined the big time with a bang.