José Luis Castillo is a Mexican former professional boxer who competed from 1990 to 2014. Generally considered one of the best lightweights of his era, he is a two-time world champion at that weight, having held the WBC title twice, from 2000 to 2002 and 2004 to 2005; and the Ring magazine and lineal titles from 2004 to 2005. Castillo is best known for his 2005 fight against Diego Corrales, for which he received Fight of the Year awards by both The Ring and the Boxing Writers Association of America, as well as his much-debated first fight with Floyd Mayweather Jr..

Hasim Sharif Rahman is an American former professional boxer who competed from 1994 to 2014. He is a two-time world heavyweight champion, having held the unified WBC, IBF, IBO and lineal titles in 2001; and the WBC title again from 2005 to 2006. He was ranked as a top 10 heavyweight by BoxRec from 2000 to 2007, and reached his highest ranking of world No.6 in 2000.