Roger Federer pulled off one of the greatest escapes of his career Tuesday, saving seven match points to come from two sets down and beat Tennys Sandgren for a place in the Australian Open semi-finals.

In a drama-packed match, the normally ice-cool Swiss was slapped with a code warning for swearing and needed a rare medical timeout for a mystery injury before winning 6-3, 2-6, 2-6, 7-6 (10-8), 6-3.

His reward is a showdown against either long-time rival and seven-time champion Novak Djokovic