Germany's forward Timo Werner (C) celebrates with teammates after scoring a goal during the 2017 FIFA Confederations Cup group B football match between Germany and Cameroon. Pic/AFP

World champions Germany have defeated 10-man Cameroon 3-1 to reach the Confederations Cup semi-finals. Germany secured the top spot in Group B after beating the Africa Cup of Nations champions at the Fisht Olympic Stadium here on Sunday, reports Efe news agency.