Porto, April 18 -- For the second year in a row, Porto had no answer to Liverpool's attacking trio of Sadio Mane, Mohamed Salah and Roberto Firmino.

A year after the forwards scored all goals in a 5-0 rout of the Portuguese champions in the round of 16 of the Champions League, the trio combined again to lead Liverpool back to the semifinals of the European tournament.

They netted a goal each in a comfortable 4-1 win over Porto on Wednesday, with Virgil van Dijk also scoring as Liverpool advanced 6-1 on aggregate after winning the first leg 2-0 at home.

Liverpool, which lost in the final last season, will now face Barcelona, which eliminated Manchester United 4-0 on aggregate on Tuesday. Tottenham advanced on away goals despite a 4-3 lo...