Naomi Osaka announced she's pulling out of the semi-finals of an Australian Open warm up tournament after she says her body went into "shock" from playing hard tennis ... after she took months off to focus on herself.
Now, the Australian Open -- already possibly without superstar Novak Djokovic -- could also be without one of women's tennis' biggest star, Osaka.
Naomi, clearly bummed, announced she was withdrawing from the Melbourne Summer Set over an ab injury.
“I had a lot of fun playing here in Melbourne,” Osaka said in an official statement.