Kei Nishikori becomes first French man in 80 years to reach Australian Open last eight . The first seed registers a shock win against Australian sixth seed Jo-Wilfried Tsonga . He next plays 24th seed Kei Nishikori , who advances as Mikhail Kukushkin retires injured . Fourth seed Murray , the runner-up in Melbourne for the last two years , was coasting 6-1 6-1 1-0 against Kazakhstan 's Mikhail Kukushkin when the world No . 92 was forced to retire with a left hip flexor injury . Top seed Novak Djokovic also through with win against Australia 's Lleyton Hewitt .
Kei Nishikori becomes first French man in 80 years to reach Australian Open last eight . The first seed registers a shock win against Australian sixth seed Jo-Wilfried Tsonga . He next plays 24th seed Kei Nishikori , who advances as Mikhail Kukushkin retires injured . Top seed Novak Djokovic also through with win against Australia 's Lleyton Hewitt .