Naomi Osaka shows off Yonex racket designed by sister Mari

Four-time Grand Slam champion Naomi Osaka took to Instagram to reveal her sister Mari helped design the latest racket from Yonex collection.

Mari, who broke into the top-300 in 2018, is now retired and she has turned her focus on fashion design.

"A brand new beautiful racquet, designed by my talented sister, Mari Osaka. Big thank you to Yonex for being like a family and supporting me all these years. (PS you can get these racquets and bag on Aug 25)," Osaka wrote on Instagram.

After being sidelined for the past two months, Osaka is set to return to action at the Mubadala Silicon Valley Classic in San Jose.

The Japanese superstar last played at the French Open, where she suffered a first round defeat to Amanda Anisimova. Osaka was hampered by an Achilles injury during that event, and she had to take a painkiller before going out onto the court for her match against the American.

After losing early at Roland Garros, Osaka decided to take an injury break and skip the entire grass season. Now, the former World No.1 is set to compete in San Jose, where she will face Zheng Qinwen in her opening match.