GENEVA—Liverpool and Ajax extended their perfect winning records in the Champions League on Wednesday to advance into the round of 16—which is starting to take a 1970s throwback look. Liverpool cruised past Atlético Madrid 2–0 at Anfield and Ajax hit 10-man Borussia Dortmund with late goals in a 3–1 come-from-behind win in Germany. The four teams with four straight wins—after Bayern Munich and Juventus sealed their places Tuesday—have already given the knockout lineup a nostalgic feel. Ajax, Bayern, and Liverpool combined to win all eight European Cup titles from 1971-78. Liverpool had never opened a Champions League group stage with four wins, though it was rarely troubled against Atlético in Group B after Diogo Jota and Sadio Mané scored in the first 21 minutes. Atlético dropped to third in the group behind Porto, which was held to a 1–1 draw at last-place AC Milan. Ajax is having a standout Champions …