By Sean Walsh Liverpool manager Jurgen Klopp believes his side’s inability to deal with aggressive man-to-man marking over the pitch was a key reason behind their 3-0 loss at home to Atalanta. The Reds’ hopes of sending Klopp off in a blaze of European glory were dealt a significant blow with a huge defeat in the first leg of their Europa League quarter-final. Former West Ham United striker Gianluca Scamacca gave Atalanta the lead just before half-time and then doubled their advantage on the other side of the break. Mario Pasalic, once on the books at Chelsea, rounded off the scoring in the fi…