Hong Kong Tennis Open organisers on Monday said that four-time Grand Slam champion Naomi Osaka is pulling out of this month's tournament due to

Naomi Osaka apologised after a troublesome back injury forced her to withdraw from the Hong Kong Open and cut her comeback season short.

Naomi Osaka apologised after a troublesome back injury forced her to withdraw from the Hong Kong Open and cut her comeback season short. The four-time major champion was expected to feature in the final WTA 500 event of the year but has pulled out, still citing an injury she suffered in the China Open against Coco Gauff this month.

Osaka retired from her fourth-round match against Coco Gauff at the China Open three weeks ago and has not played since.

The 27-year-old has reportedly ruptured abdominal muscles, but Hong Kong tennis chiefs have yet to hear from Japanese star.

Naomi Osaka will miss the rest of the WTA tour due to a back injury. She has withdrawn from the Hong Kong Open and ended her season early. Osaka hasn't played since retiring from a match at the China Open,

Japan's Naomi Osaka said she will skip next month's Billie Jean King Cup Finals in Spain as she recovers from injuries that have kept her out of key tournaments during the WTA's Asian swing.