The Argentine International first nicked the ball off the careless Ashley Young and then watched as a weak shot from distance squirmed underneath David de Gea.
Former English Premier League and Liverpool star, Philippe Coutinho, who had what could be tagged as his best performance of the season, added a third with a curling effort into the top corner to end the game 3-0 and 4-0 on aggregate.
Meanwhile, Liverpool, who take a 2-0 lead to Porto on Wednesday, are the most likely obstacle between Barca and their first Champions League final since they last won the tournament in 2015.
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