Naomi Osaka is known for bringing her A-game in both fashion and tennis whenever she steps onto the court. In the past week, however, it’s Osaka’s mother, Tamaki Osaka, whose striking fashion choices have been stealing the spotlight.At Naomi’s recent US Open match against Katerina Siniakova on September 3, Tamaki was spotted sitting courtside in a fashionable white dress shirt and a silver-grey jacket, paired with a matching grey tie and white fingerless gloves.Tamaki Osaka watches as her daughter, Naomi Osaka, competes against Katerina Siniakova in the second round of the US Open. Photo: ReutersA few days earlier, she turned heads in an eye-catching red minidress with black gloves, sunnies, and a bold red lip while watching her daughter during her US Open practice session.Here’s everything you need to know about Naomi Osaka’s fashionable mum, Tamaki Osaka.What is Tamaki Osaka’s background?Tamaki Osaka applauds during the third-round singles match between her daughter, Naomi Osaka, and Belgium’s Elise Mertens at the US Open on September 5. Photo: AFPTamaki grew up in Hokkaido, Japan, and met her husband, Leonard Francois, when she was graduating from high school and he was a university student in Japan, per People.The pair dated for several years, keeping their relationship secret until Tamaki’s father tried to set her up for an arranged marriage. Tamaki and Francois, who is from Haiti, later relocated to Osaka together after Tamaki’s father disapproved of their relationship.They welcomed their two daughters, Mari and Naomi, in 1996 and 1997 respectively. Tamaki and Francois decided to give their daughters Tamaki’s maiden name “Osaka” for practical reasons while living in Japan.The family later relocated to the United States to give their daughters better tennis training opportunities, according to People.