Did Mayweather break doping rules before beating Pacquiao? American hits back at ‘false’ claims
Boxer took vitamins through intravenous drip, a violation of Wada rules, but Usada say he did no wrong

Floyd Mayweather hit back at accusations he violated anti-doping rules after it emerged he had received an injection of vitamins and minerals on the eve of his superfight with Manny Pacquiao in May.
The United States Anti-Doping Agency (Usada) leapt to Mayweather’s defence on Thursday, stating that the injection was legal and that reports to the contrary were “false.”
“I follow and have always followed the rules of Nevada and Usada, the gold standard of drug testing,” Mayweather said in a statement.
“I am very proud to be a clean athlete and will continue to champion the cause,” added Mayweather, who is chasing history in Las Vegas on Saturday when he meets Andre Berto in a bid to match Rocky Marciano’s 49-0 record.