Watch Photos: Pacquiao gets to work for Mayweather clash

WBO welterweight champion Manny Pacquiao is putting in the hard graft ahead of the Filipino's eagerly-anticipated clash with arch-nemesis Floyd Mayweather Jr.

The pound for pound pair collide on May 2 in Las Vegas as the world famous MGM Grand in Las Vegas in a fight to finally decide who is the best fighter of this generation.