Naomi Osaka had the home crowd on her side but could not continue her Japan Women's Open run on Thursday, losing 6-3, 6-2 in the second round to sixth-seeded Zhang Shuai of China at Ariake Tennis Forest Park.

The 18-year-old Osaka, ranked 69th in the world, amassed 13 winners against 49th-ranked Zhang but was outdone by the consistency from the 27-year-old, who returned well and made few mistakes in their first meeting.

"I think I may have complicated it more in my mind, how I was supposed to play might have been more simple," Osaka said. "Today I didn't really adjust to the fact that she was going to return and react to what I'm doing."