Sadio Mane scored twice as Liverpool ensured there will be four English sides in Friday’s Champions League quarter-final draw with a hugely impressive 3-1 win away to Bayern Munich to progress by the same score on aggregate. Bayern goalkeeper Manuel Neuer was partly at fault for Sadio Mane’s opening goal. (AFP/Odd ANDERSEN) The Senegalese’s stunning opener was quickly cancelled out by Joel Matip’s own goal. But Virgil van Dijk’s towering header restored the visitors’ lead 21 minutes from time and Mane added a third with a diving header of his own to which an ageing Bayern side had no response. Here, AFP Sport looks at three things we learned from Liverpool’s triumph at the Allianz Arena: Mane steps out from Salah’s shadow As goals for Mohamed Salah have dried up of late, Mane has stood up when his side have most needed him. An exquisite touch to control Van Dijk’s raking pass, poise to round Manuel Neuer and calm to chip the ball into the empty net gave Liverpool control of the tie with an away goal. A second for the Senegalese six minutes from time took his tally for the season to 19, 10 of which have come in…