Australian Open: Djokovic reaches semis after Musetti retires with injury

By JOHN PYE AP Sports Writer MELBOURNE, Australia — Novak Djokovic was the first to admit he’s lucky to be back in the Australian Open semifinals instead of Lorenzo Musetti. Despite being two sets down, slowed by a serious blister on his foot and already thinking about his flight home, the 24-time major winner won Wednesday’s quarterfinal when fifth-seeded Musetti retired with an injury. Musetti took the first two sets 6-4, 6-3 but needed a...