(CNN)Defending champion Naomi Osaka has been knocked out of the Australian Open by unseeded American Amanda Anisimova.Two-time Australian winner Osaka had gone a set up in the high quality match on Friday but failed to close it out, with the 20-year-old Anisimova completing her comeback in a third set tie-break to win 4-6 6-3 7-6 (10-5).More to follow.
Naomi Osaka: Two-time winner knocked out of Australian Open by American Amanda Anisimova
