Barcelona kept up their unbeaten La Liga record this season as they traveled to triumph over Athletic Bilbao.
The hosts scored after just eight minutes when Paco Alcacer, who supplanted the suspended Luis Suarez, guided in Jordi Alba's drawback.
Lionel Messi made it 2-0 with a low 20-yard strike following great work by partner Ousmane Dembele.
Philippe Coutinho additionally hit the crossbar twice and Paulinho hit the post for La Liga's pioneers.
Barcelona ar 11 focuses clear at the highest point of the table, with second-put Atletico Madrid playing at Villarreal later on Sunday (17:30 GMT).
No La Liga group has gone a whole alliance battle without vanquish; Barcelona have nine association diversions remaining, having won 23 and drawn six of 29 matches played up until this point.
The record for an unbeaten keep running from the beginning of a La Liga season is 32 amusements, set by Real Sociedad in 1979-80.