British sprinter CJ Ujah's B-sample has tested positive and his case will be referred to the Court of Arbitration for Sport. "I take it as the most serious allegation ever put in front of me and I will fight to the end to prove I am not that person." "I am completely shocked and devastated by this news. Speaking after the win, Muguruza said the "big trophies" were her motivation.Your 2021#AKRONWTAFinalssingles champion!🇪🇸@GarbiMuguruza🏆pic.twitter.com/1K5ASTuJMR