The Argentine star opened the scoring with a penalty that he executed smoothly at 23 minutes. In the discounts of the first part caused the screams in the stands of the Camp Nou with his left foot after a foul near the arch.
He crowned his great performance with a new free kick, which overcame the barrier and entered touching a pole at the start of the complement at 48. Sergio Busquets signed the final goal at 85.
Uruguayan Lucas Olaza had momentarily matched for visitors at 42, also with an excellent charge.
Barcelona started under the pressure of being playing the status of leader on the 13th day, after Real Madrid had thrashed 4-0 in his visit to Eibar. With the victory, the Blaugranas remain at the top with 25 points, the same amount as the meringues, but with better goal difference.