Andy Murray knocked Roger Federer out of the Masters Cup in Shanghai as the defending champion struggled with a lower back injury in a dramatic match.
World number two Federer had to win the final round-robin match in the Red Group to stay in the tournament, but he went down 4-6 7-6 (7-3) 7-5 to Murray.
World number two Federer had to win the final round-robin match in the Red Group to stay in the tournament, but he went down 4-6 7-6 (7-3) 7-5 to Murray.