The World Anti-Doping Agency (WADA) was in full damage control mode on Monday (April 22), firing back at criticism over its handling of 23 positive tests from Chinese swimmers that the head of the United States Anti-Doping Agency (USADA) called a potential cover-up.

Russian superstar Maria Sharapova on Wednesday vowed to appeal a two-year doping ban which looks certain to end one of sport's most celebrated and high-profile careers.