Former world No. 1 Naomi Osaka retired from the ASB Classic final in Auckland on Sunday due to an abdominal injury after winning the first set against Clara Tauson.

Naomi Osaka retired from her Australian Open third round match on Friday.

Naomi Osaka’s fitness for the Australian Open is in question after the four-time Grand Slam champion and former No. 1 suffered an apparent abdominal injury while playing the final of a WTA tournament in Auckland.

Naomi Osaka's Australian Open campaign has taken on an element of doubt after the four-time Grand Slam champion and former No. 1 suffered an apparent injury Sunday while playing the final of a WTA tournament in Auckland.

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, but her exit left Tauson as the tournament's champion.

Two-time Australian Open champion Naomi Osaka stopped playing because of a strained abdominal muscle after dropping the opening set of her third-round match against Belinda Bencic. “I kind of have a history of it,

Naomi Osaka's quest for a first title in four years ended in heartbreak as the former world number one retired with an injury after winning the opening set of the Auckland Classic final against Denmark's Clara Tauson on Sunday.

Osaka retired from the ASB Classic final in Auckland due to an abdominal injury. The four-time Grand Slam champion won the first set against Clara Tauson 6-4 before taking an immediate medical time-out that would signal the end of the match. Due to injury, Osaka has retired from the match. Clara Tauson is the champion with a final score of 4-6.

After losing the first set 7-6 (3), two-time Australian Open champ Naomi Osaka retired from her third-round match against Belinda Bencic due to injury.