US Open 2019: Naomi Osaka frets over knee injury

(CNN)With the US Open just days away, Naomi Osaka is fretting over a knee injury after she was forced to retire from the Cincinnati Masters on Friday. Osaka, who is the first player from Japan to win ... ( read original story ...)

Osaka retires at Cincinnati with knee injury

(Reuters) - World number one Naomi Osaka retired from the Cincinnati Masters with an apparent knee injury on Friday, less than two weeks before the start of her U.S. Open title defence. Osaka was ... ( read original story ...)