Floyd Mayweather Jr.

The sport of boxing requires sacrifice, discipline, concentration, and determination, but for heavy-weight champion Manny Pacquiao, it was survival.

A look at the American professional fight promoter and former pro boxing star highlights his best battles in the ring and his trademark showmanship.

Watch as professional boxer Amir Khan puts in hours training in the hopes of challenging the unbeaten superstar Floyd Mayweather.