boycotting a previous tournament match to show her support for the victims of police violence, Naomi Osaka is taking more steps to raise awareness during the US Open.The Japanese tennis star — who is currently the highest-paid female athlete in the world — has worn a mask honoring Black victims of police brutality and racial injustice at each of her US Open showings.On Thursday, Osaka honored Philando Castile by wearing his name on her sixth mask for her match at the USTA Billie Jean King