Kei Nishikori becomes first Japanese man in 80 years to reach Australian Open last eight . The 24th seed registers a shock win against French sixth seed Jo-Wilfried Tsonga . Djokovic wins his third straight match on Centre Court and moves into the top 10 for the first time since 2009. Top seed Novak Djokovic 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 shock win against French sixth seed Jo-Wilfried Tsonga . He next plays fourth seed Andy Murray , who advances as Mikhail Kukushkin retires injured . Top seed Novak Djokovic also through with win against Australia 's Lleyton Hewitt .