The world No. 7 spent most his career with two otherworldly rivals. He is in that situation once again, with one beaten so far in Melbourne.

It's the blockbuster semi-final of the Australian Open - Novak Djokovic and Alexander Zverev at Rod Laver Arena on a Friday afternoon.

Alexander Zverev is into the Australian Open final after Novak Djokovic retired injured after the first set at Rod Laver ...