Barcelona face Elche, who are bottom of La Liga, at the Manuel Martinez Velero stadium in the first game after the international break.
Lewandowski scored the opener in the 20th minute although Machin's side tried to threaten the Catalan club's box from the start of the match.
Xavi's side won a free kick, Jordi Alba took it and the Poland international struck from inside the box to give his side the lead.
If the match ends like this, Barcelona would stay at the top of the table with 71 points, 15 points behind second-placed Real Madrid.
April 1, 2023