Kei Nishikori becomes first Japanese man in 80 years to reach Australian Open last eight . The 22-year-old , who will next face world No . 4 The 24th seed registers a comeback win against French sixth seed Jo - Marie Tsonga . He next faces fourth seed Andy Murray , who advances as Mikhail Kukushkin retires injured . Top seed Novak is also through with win against Australia 's Lleyton Hewitt .
Kei Nishikori becomes first Japanese man in 80 years to reach Australian Open last eight . The 24th seed registers a comeback win against French sixth seed Jo - Marie Tsonga . He next faces fourth seed Andy Murray , who advances as Mikhail Kukushkin retires injured . Top seed Novak is also through with win against Australia 's Lleyton Hewitt .