Naomi Osaka 大坂なおみ on Instagram: “Happy birthday to my sister/best friend/worst enemy 😩❤️🎂🎉🎊 @mari.osaka @ctrlsaregone you're old…

Trust that next year is gonna come with lots of trophies - Tennis fans send special wishes to Naomi Osaka on her 25th birthday

Naomi Osaka's Fashion Designer Sister Mourns Heart-Breaking Loss as She Shares Traumatic Story - EssentiallySports

Naomi Osaka weird with her sister Mari. INSTAGRAM VIDEO - Tennis Tonic - News, Predictions, H2H, Live Scores, stats

Naomi Osaka and her sister Mari looking beautiful in Nike shoot. PICTURES, VIDEO - Tennis Tonic - News, Predictions, H2H, Live Scores, stats

WATCH: Osaka and friends post a dance video on vacation

Naomi Osaka's Fashion Designer Sister Mourns Heart-Breaking Loss as She Shares Traumatic Story - EssentiallySports

Happy Belated Birthday Naomi Osaka (26)

Naomi Osaka and her lovely happy birthday to her sister Mari - Tennis Tonic - News, Predictions, H2H, Live Scores, stats

Naomi Osaka's sister admits tennis star 'saved' her life in touching tribute

Naomi Osaka writes hilarious message to her sister after win over Serena Williams at Australian Open

Naomi Osaka 大坂なおみ on Instagram: “Happy birthday to my sister/best friend/worst enemy 😩❤️🎂🎉🎊 @mari.osaka @ctrlsaregone you're old…

Naomi Osaka and her sister go on IG Live in search of some good jokes and meet with mixed results

Naomi Osaka celebrates her birthday on the beach in lovely pink dress. PICTURES - Tennis Tonic - News, Predictions, H2H, Live Scores, stats