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’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.