Junior Jones is an American former professional boxer who competed from 1989 to 2002. He held world championships in two weight classes, including the World Boxing Association (WBA) bantamweight title from 1993 to 1994 and the World Boxing Organization (WBO) super bantamweight title from 1996 to 1997. He also held the International Boxing Organization (IBO) featherweight title from 1999 to 2000.

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..