AUCKLAND, Jan 5, 2025 (BSS/AFP) - Naomi Osaka retired from the final of the Auckland Classic with an abdominal injury Sunday, a blow to the Japanese star just a week before the start of the Australian Open.

Playing in her first WTA final for three years, against Denmark's Clara Tauson, the four-time Grand Slam champion called for the physio after taking the opening set 6-4 and pulled out shortly afterwards.

Osaka's sudden withdrawal came as a shock after playing with no apparent problem in the 35-minute opening set, unleashing some powerful groundstrokes to break her opponent in the third and fifth games.

At the changeover, the 27-year-old stood and performed a series of stretches during a medical timeout.

After consulting with the trainer she shook the hand of Tauson, who picked up a third career title and her first since 2021.

Osaka didn't divulge details of what forced her withdrawal in a short courtside interview.

However, in a statement, the WTA said she retired "due to an abdominal injury".

"I just want to thank everyone for welcoming me to such a beautiful city and I had a lot of fun playing here and I'm really sorry about how it ended," Osaka said.

"I hope you did enjoy the tennis that we did play and I'm just really grateful to be here."

It was an anti-climactic finish to the week for Osaka, who was chasing her first title since winning the 2021 Australian Open.

Her most recent final appearance was at the Miami Open the following year, before taking a 15-month break and giving birth to her first child midway through 2023.

She returned to tennis 12 months ago and has climbed to 57th in the world rankings.