Two-time champion Naomi Osaka has pulled out of the Australian Open, organizers of the season’s first Grand Slam which begins on Jan. 16 announced on Sunday without elaborating on the reason.

The Japanese former world number one’s name was on the entry list for the Australian Open but Osaka was not scheduled to play in warm-up tournaments in Adelaide and Hobart, raising doubts about her participation in the hardcourt major.

“Naomi Osaka has withdrawn from the Australian Open. We will miss her at #AO2023,” the Australian Open tweeted. “Dayana Yastremska moves into the main draw.”

Osaka, the 2019 and 2021 Melbourne Park champion, has not played on the WTA Tour since pulling out of her match against Beatriz Haddad Maia in the Pan Pacific Open second round in Tokyo in September due to illness.

Her withdrawal comes a day after American seven-times Grand Slam champion Venus Williams was ruled out of the Australian Open due to injury in a double blow to the organizers.

Osaka, who has slipped to 42 in the world rankings, had taken a break to prioritize her mental health after skipping the 2021 French Open and later said that she was battling depression.