Osaka won the opening set 6-4 in Sunday's final, but was forced to retire hurt after taking a medical time out, handing the title to Clara Tauson

The former world No. 1 and four-time Grand Slam champion retired from the final of the WTA Auckland Open, the last tune-up before the Australian Open, with an apparent medical issue on Sunday. She had been leading Denmark's Clara Tauson 6-4 before her exit left Tauson as the tournament's champion.

Naomi Osaka retired from the Auckland final in shocking and devastating scenes as the No. 7 seed was up by a set when she had to call a medical timeout and call it a day.