US Open winner Naomi Osaka speaks out on controversial Serena Williams match

05:09

Twenty-year-old Naomi Osaka beat Serena Williams in a U.S. Open final that took an emotional turn after the umpire penalized Williams for three violations. After the tense match, there were boos from the crowd. In that moment, Osaka tells TODAY, she was “a little bit sad,” saying, “I wasn’t sure if they were booing at me.”