Real Madrid visit Rayo Vallecano Sunday night looking for a win to cut the gap.
Elsewhere in La Liga, Getafe and Sevilla drew 1-1 while struggling Granada beat sixth-placed Rayo Vallecano 2-0.
Neighbors, Real Madrid -- who are third in the table -- also play on Sunday, hosting sixth-place Rayo Vallecano.
Malaga warmed up for their Champions League clash with reigning German champions Borussia Dortmund with a 3-1 away to Rayo Vallecano.
Malaga did get a big win at midtable Rayo Vallecano, while Bayern Munich stomped all over Hamburg by an eye-popping 9-2 margin.
Earlier, two goals from Miguel Perez 'Michu' helped Rayo Vallecano beat Osasuna 6-0 to virtually guarantee their place in La Liga next season.
Agirretxe scored both goals as Sociedad overcame Rayo Vallecano 2-0 to open up a four point gap between itself and fifth place Malaga.
It put Jose Mourinho's team four points clear of third-placed city rivals Atletico, who travel to Osasuna on Sunday while Barca host Rayo Vallecano.
Valencia climbed into the fourth Champions League place with a 4-0 win at midtable Rayo Vallecano, moving a point above Real Sociedad -- who host Granada on Monday.
In La Liga's other Saturday matches, Valencia played out a 2-2 draw with Levante while the game between bottom-of-the-table Deportivo La Coruna and ninth-place Rayo Vallecano ended goalless.
Coach Jose Mourinho had made seven changes following last weekend's win over Rayo Vallecano, ahead of Tuesday's second leg of the Spanish Super Cup at Barca's Camp Nou.
Real Zaragoza moved out of the bottom three with a 3-0 win that left Rayo Vallecano behind Sevilla on goal difference, while bottom club Mallorca drew 1-1 with midtable Levante.
In Saturday's other La Liga fixtures Malaga fought back from a goal down to beat Getafe 3-1, while Rayo Vallecano clawed back a two-goal deficit to beat 10-man Racing Santander 4-2.
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