Novak Djokovic reaches Australian Open semis as Lorenzo Musetti retires

(Photo credit: Mike Frey-Imagn Images)Fortune is smiling on Novak Djokovic at the Australian Open.The fourth-seeded Serbian was down two sets to none in the quarterfinals on Wednesday in Melbourne when his opponent, fifth-seeded Lorenzo Musetti of Italy, retired due to an injury.Musetti was ahead 6-4, 6-3, 1-2 when he got hurt and used a medical timeout to receive treatment on his right thigh. He t