Powered by a fiery Ousmane Dembele, with two assists and classy action, the Catalans scored three goals through Memphis Depay (30th) and Pierre-Emerick Aubameyang (41st, 48th), before Iago Aspas reduced the gap for the Galicians in the 50th.
With two new assists, Dembélé overtook fellow Frenchman Karim Benzema (Real Madrid) to become La Liga's top assist provider, with 13 assists in just 20 appearances this season.
The match was especially marked by the evacuation by ambulance of Ronald Araujo shortly after the hour mark: the Uruguayan defender crashed his head against that of Gavi on an aerial ball, then staggered, grimacing before collapsing on the lawn.
His team-mate Eric Garcia and the opposing captain Iago Aspas gave him first aid, then the trainers and an ambulance entered the Camp Nou lawn, put him on a stretcher and evacuated him.
"We were scared, but the doctor reassured us, he told us that he was conscious, that he was fine, that he was out of danger. He will spend the night in the hospital as a precaution, but he's fine, he may be able to go home tomorrow," Xavi slipped in a post-match press conference.
A few minutes earlier, the Colombian Jeison Murillo had just been sent off (58th) twelve minutes after entering the game at the break, and let his team finish the match at ten after a foul as the last defender on Depay at the start. from the surface.
Ticket for the Supercup
Thanks to this success, Barça has almost secured its second place in La Liga: the Blaugranas, who validated their ticket for the next Champions League last weekend, are now seven points ahead of Sevilla (3rd, 65 pts ), which receives Wednesday (8:30 p.m.) the first relegation, Mallorca.
If the Andalusians do not win, the Catalans, two days from the end of the championship, will be assured of the place of runner-up to Real Madrid, which will get them a ticket for the Spanish Super Cup.
Earlier this Tuesday, Betis Sevilla easily won 3-0 on the lawn of Valencia, thus putting pressure on Atlético Madrid, who go to Elche on Wednesday (9:30 p.m.): the Béticos are only three points from the top 4 and qualifying places for the next C1.
Granada, for their part, snatched an essential success on their ground 1-0 against Athletic Bilbao thanks to a blunder from the Basque defense, and took a step closer to maintaining, currently 16th, five points from the first relegation zone. , Mallorca (18th, 32 pts), which moves to Seville on Wednesday.