The Kazakh star defeated Yulia Putintseva 6-2, 6-3 to reach the quarterfinals, while home favourite Naomi Osaka lost to 18-year-old Mia Pohankova. 1 as Osaka falls to rising star Pohankova; Putintseva ousted in Tokyo. 1 Elena Rybakina secured the year-end top ranking after defeating Yulia Putintseva in the second round of the Pan Pacific Open in Tokyo on Thursday, while home favourite Naomi Osaka.