Mayweather-Pacquiao undergo drug testing before 'fight of the century' bout

Unbeaten US boxing champion Floyd Mayweather and Filipino boxer-turned-politician Manny Pacquiao have been leaving no stone unturned in ensuring that they enter the ring for Saturday's 'fight-of-the-century' bout completely drug-free.

Mayweather would go head-to-head against Pacquiao in a mega bout in Las Vegas on May 2 in a bid to prove that he is the greatest fighter of his generation.

Travis Tygart, the chief executive of the United States Anti-Doping Agency (USADA), said that a real tribute to both of these fighters for voluntarily agreeing to do it, Stuff.co.nz reported.

Tygart added that it speaks volumes for the importance of health and safety in a sport like boxing and just as importantly, for the integrity of the competition.

USADA is the independent agency that supervises drug-testing for the fight by using the same stringent practices and standards it applies to US Olympic athletes.