Japan's Naomi Osaka has withdrawn injured from the semi-final of an Australian Open warm-up tournament, but the defending champion says she still intends to play in the Grand Slam.

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.

Osaka 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 due to face Osaka in the semi-final and will now advance to the final to face Romania's Simona Halep.