The final three quarter finalists have been found at the Guam Futures tennis tournament.
Junn Mitsuhashi and Yasutaka Uchiyama made it six Japanese players in the last eight after wins over Germany's Ralph Regus and fellow national Shinta Fujii.
While fourth seed Brendan Moore beat his fellow Australian Nathan Willis 6-4 6-1.
On Friday top seed Daniel Yoo takes on Bumpei Sato in the last eight, Hiroyasu Ehara faces Moore, Mitsuhashi and Uchiyama clash while Jun Ito to meet Toshihide Matsui.
