Former world number one Naomi Osaka has pulled out of the Japan Open due to a back injury that forced her retirement from the China Open last week, organisers said on Monday.

Naomi Osaka has been forced to pull out of the WTA 250 event in Osaka, Japan, just a week after being forced to retire from her China Open clash with Coco Gauff

Naomi Osaka has pulled out of the upcoming WTA 250 event in Osaka, Japan as her injury woes continue. The former world No. 1 was forced to retire from her China Open clash with Coco Gauff last week. She later revealed she had a back injury and wasn't planning to take to the court at all.

The 26-year-old former world number one looked in good touch as she recorded three wins at the China Open in Beijing last week. But in her last-16 match, against eventual champion Coco Gauff, Osaka retired at the end of the second set because of a back injury.