MELBOURNE: Kei Nishikori shocked former finalist Jo-Wilfried Tsonga in five sets to become the first Japanese man into the Australian Open quarter-finals in 80 years on Monday.
The 24th seed dug deep to knock out sixth seed Tsonga, 2-6, 6-2, 6-1, 3-6, 6-3 in 3hr 30min in sweltering conditions on Hisense Arena.