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Lewandowski struck after eight minutes for the hosts, poking home Raphinha’s ball across the box at the back post.
Barca doubled their lead as Brazil forward Raphinha netted the rebound from Pedri’s blocked shot.
The La Liga leaders continued to dominate as Inigo Martinez added another goal three minutes later, heading in from close range after Pedri’s pinpoint free-kick.
Six minutes into the second half Barca found the back of the net once more, with Martinez’s header back across goal prodded in by Lewandowski.
Joel Monteiro’s strike hit the crossbar in the away side’s best chance of the match.
Young Boys’ misery was compounded in the 81st minute when Mohamed Ali Camara turned Alejandro Balde’s cross into his own net.
Monteiro thought he had a goal back for Young Boys in stoppage time but his low finish was ruled out for offside following a video assistant referee (VAR) check.
The Swiss champions remain winless after losing 3-0 to Aston Villa in their opener.
