Twin vehicle attacks on Thursday killed 14 people and wounded around 120 in Barcelona's bustling Las Ramblas boulevard and the nearby seaside resort of Cambrils.
A minute's silence was held before kick-off, whilst Barcelona players wore black armbands and shirts with 'Barcelona' replacing individual names on the back.
Prior to the attacks, Barca had endured a difficult start to the season on the field as shorn of Neymar following his world record 222 million euro ($261 million) move to Paris Saint-Germain, the Catalans were swept aside 5-1 on aggregate by Real Madrid in the Spanish Super Cup.
Barcelona took the lead in the game when Alin Tosca deflected Gerard Deulofeu's cross into his own net.
Sergi Roberto then swept in a second.
Lionel Messi, the focal point of the Barcelona forward line in the absence of Neymar and the injured Luis Suarez, hit the woodwork three times as he pursued his 350th La Liga goal.
But it was former Everton forward Deulofeu who made the difference, providing the assist for Roberto's goal after his cross had led to the opener.
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