She has taken mental health breaks in recent years and didn't play again after the Pan Pacific Open in Tokyo, shortly after falling in the first round of the U.S. Open. Osaka said the few months away have given her "a new love and appreciation for the game I've dedicated my life to."
Ash Barty, the 2022 Australian Open champion, announced last week she was pregnant. She retired last year while holding the No. 1 ranking.
But Osaka said she will return to tennis and plans to be in Melbourne next year for the start of the Grand Slam season.
"2023 will be a year that'll be full of lessons for me and I hope I'll see you guys in the start of the next one cause I'll be at Aus 2024," Osaka wrote. "Love you all infinitely."
Osaka closed by saying she doesn't know if there's a perfectly correct path in life, but that "if you move forward with good intentions you'll find your way eventually."