Four-time Grand Slam champion and former World No.1 Naomi Osaka is pregnant with her first child. 

The 25-year-old revealed the news in a social media post on Wednesday, penning a heartfelt note to fans in both English and Japanese that accompanied a photo of an ultrasound. 

"Can't wait to get back on the court, but here's a little life update for 2023," she wrote.

WTA Chairman & CEO Steve Simon offered his best wishes to Osaka.

“The WTA family congratulates Naomi on this very special news," he said. "As she now embarks on this exciting next chapter in her life, we celebrate her becoming a mom and look forward to seeing her back on the court when she and the family are ready.”

American teenager Coco Gauff was among the peers to congratulate Osaka after her announcement.

No official reason was given by the Australian Open when the tournament announced Osaka's withdrawal last week, and she says she hopes to come back better than ever to the Hologic WTA Tour in 2024, with a new young fan in tow. 

"These few months away from the sport has really given me a new love and appreciation for the game I've dedicated my life to," she added. 

"I know that I have so much to look forward to in the future; one thing I'm looking forward to is for my kid to watch some of my matches and tell someone, 'That's my mom.'

"2023 will be a year that'll be full of lessons for me, and I hope I'll see you guys at the start of of the next one 'cause I'll be at Aus 2024."

Osaka last played at the Toray Pan Pacific Open in Tokyo in September, where she won her first match against Daria Saville via a retirement before withdrawing ahead of her second-round match with Beatriz Haddad Maia due to abdominal pain. 

Off the court, she celebrated the release of her children's book "The Way Champs Play," in December, and earlier this month she announced she signed on with the sports agency Evolve.