Jannik Sinner into Australian Open round two as opponent retires

Jannik Sinner strolled into the second round of the Australian Open on Tuesday when his opponent retired with the two-time defending champion in full control. The Italian second seed led 6-2, 6-1 when France’s Hugo Gaston called it quits with an apparent injury after 68 minutes on Rod Laver Arena. READ: Jannik Sinner says doping