Serena Williams of the US reacts against Naomi Osaka of Japan during their Women's Singles Finals match at the 2018 US Open at the USTA Billie Jean King National Tennis Center in New York. Serena Williams has been fined $17,000 by the US Tennis Association in the wake her outburst during a controversial US Open final loss to Japan's Naomi Osaka. The American star was fined for coaching, racquet abuse and for verbal abuse when she accused umpire Carlos Ramos of being "a thief" during Saturday's stormy final. AFP PHOTO