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Robert Lewandowski scored a brace as Barcelona cruised to a 4-1 victory at Real Sociedad on Sunday, their first win of the new LaLiga season.

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Spanish teenage sensation Ansu Fati, who has been struggling to recover after a series of knee surgeries in the last two years.

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came off the bench in the second half and took charge of the proceedings with two assists and a goal. 

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The Poland striker, who was celebrating his birthday, opened the scoring in the first minute of the game, rifling in a shot after a great pass from Alejandro Balde inside the penalty area. 

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But Alexander Isak equalised five minutes later after latching onto a pass from David Silva. 

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Barca struggled to break the deadlock until coach Xavi Hernandez sent on Raphinha and Fati in the 64th minute, with both proving crucial to Barca's success. 

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First, Fati assisted Ousmane Dembele with a brilliant heel pass after a fine piece of individual play from Raphinha. 

Image Credit: USA Today

First, Fati assisted Ousmane Dembele with a brilliant heel pass after a fine piece of individual play from Raphinha. 

Image Credit: USA Today

Lewandowski returned the favour 10 minutes later, enabling 19-year-old Fati to score Barca's fourth to wrap up the points. 

Image Credit: USA Today

"It was a difficult game, it always is when you come here," Xavi said after the match. "We play with more patience, like in the second half, we're much better.