The Poland international scored twice and Lamine Yamal netted a deflected free-kick as Hansi Flick's side won comfortably.
Barcelona restored their three-point lead at the top of La Liga with a 4-1 win over Girona on Sunday.
Hansi Flick's side enjoyed a strong start to the game, peppering Girona's goal with shots, and after 10 minutes, Fermin Lopez believed he had won a penalty as he went down in the area. A VAR review followed, however, and the referee instead gave a free-kick to the visitors.
Ronald Araujo had one of the biggest chances of the first-half, heading towards goal at a corner, but he was denied by a superb save from Paulo Gazzaniga.
Barca were frustrated by Girona's rearguard action and Jules Kounde was frustrated after he saw his opening goal ruled out for offside.
The hosts needed a slice of luck to take the lead, as Lamine Yamal's free-kick was deflected beyond the stranded Gazzaniga by Ladislav Krejci.
After half-time, though, Girona stunned Flick's side as Arnaut Danjuma equalised, running beyond Araujo and finishing superbly into the bottom corner.
Barcelona soon had their lead back, as Robert Lewandowski acrobatically flicked Fermin's header beyond Gazzaniga, and he completed his brace in the 77th minute with a superb low finish late in the second half.
There was still time for substitute Ferran Torres to score Barcelona's fourth, finishing brilliantly after rising from the bench.
GOAL rates Barcelona's players from Estadi Olímpic Lluís Companys…
AFPGoalkeeper & Defence
Wojciech Szczesny (6/10):
Beaten all ends up by Danjuma's exceptional finish. Didn't have much else to do but will be disappointed to have conceded.
Jules Kounde (3/10):
Scored but saw it ruled out. Dribbled past on no fewer than three occasions. This was not a good performance.
Ronald Araujo (6/10):
Forced Gazzaniga into a superb save. Flat-footed when Danjuma sprinted clear but was Barca's best defender.
Inigo Martinez (5/10):
Passed the ball well – he always does – but was not able to dominate in his usual fashion, defensively.
Gerard Martin (6/10):
Replaced Alejandro Balde in the XI but has nothing like his dynamism and engine. Got forward when he could but he's just not as good as his team-mate.
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Pedri (8/10):
Superb as ever. Has developed into a brilliant, all-action midfielder, as evidenced again here.
Eric Garcia (6/10):
Hit the post. A workmanlike performance but in transition, he was occasionally found wanting. To be expected for a defender playing in midfield.
Gavi (5/10):
Seemed to play off the left but was peripheral. Barca's attacks mainly came down the right, and he just couldn't get into the game.
AFPAttack
Lamine Yamal (8/10):
Twinkle-toed throughout. His free-kick was deflected in but he deserved a slice of luck, such was his skill and energy. Unfortunate not to add a second as he hit the bar from range in injury time.
Robert Lewandowski (9/10):
Scored a superb brace, first a stylish flick and then a powerful low finish. So deadly, and ageing like a fine wine.
Fermin Lopez (8/10):
Thought he had won a penalty but was punished for a foul instead. A constant handful, driving at Girona whenever he could.
AFPSubs & Manager
Frenkie de Jong (7/10):
Replaced Gavi. Superb pass for Lewandowki's second.
Ferran Torres (7/10):
On for Fermin. Scored a superb goal, dribbling beyond a defender and finishing smartly.
Pau Cubarsi (N/A):
Replaced Martinez late.
Alejandro Balde (N/A):
On for Garcia. Drove at Girona constantly after his introduction.
Pablo Torre (N/A):
Barca's final sub.
Hansi Flick (8/10):
Barca are back on top, and after a comfortable win to boot. Flick has moulded this Barca team into a frightening unit, and they just keep delivering.
