She withdrew from the Melbourne Summer Set because of an abdominal injury.

Osaka says she will "rest and prepare for the Australian Open", which begins on 17 January.

She wrote on Twitter: "Sad to withdraw due to injury from my match today, my body got a shock from playing back to back intense matches after the break I took. I'll try to rest up and I'll see you soon!"

The four-time Grand Slam champion took an indefinite break from tennis after losing to eventual finalist Leylah Fernandez in the third round of September's US Open.

That came after a turbulent year in which she said she would not do news conferences at the French Open to protect her mental health, later pulling out of the event, missing Wimbledon and revealing she had experienced anxiety and depression.

Osaka - now ranked 13th in the world - said her main target for 2022 is "having fun" on the court. She had won her first three matches at the Melbourne tournament.

Russia's Veronika Kudermetova was set to face Osaka in the semi-final and will now advance to the final to face Romania's Simona Halep, who beat China's Zheng Qinwen 6-3 6-2.

Also playing her first tournament since the US Open, Wimbledon champion Ashleigh Barty beat French Open winner Iga Swiatek 6-2 6-4 to reach Sunday's Adelaide International final.

Australian Barty will play Kazakhstan's Elena Rybakina after the seventh seed beat Japan's Misaki Doi 6-4 6-3 earlier on Saturday.