Tennis: Osaka suffers Pan Pacific Open upset against 18-yr-old Pohankova

Naomi Osaka, former world No. 1 and four-time Grand Slam champion, was upset in the second round of the Pan Pacific Open by 18-year-old Slovakian Mia Pohankova, ranked 144th. Pohankova outplayed Osaka with superior winners and aces, winning 6-3, 7-5 in Tokyo.