Novak Djokovic reaches Australian Open semi-finals after Lorenzo Musetti retires

Lorenzo Musetti receives treatment for a right thigh injury. Pic: Asanka Brendon Ratnayake/AP

Novak Djokovic was given an Australian Open reprieve when quarter-final opponent Lorenzo Musetti retired injured leading by two sets to love.

An out-of-sorts Djokovic looked to be heading for the exit door, but Musetti sought treatment for a thigh injury after three games of the third set and played just one more game before shaking hands.