Nikolai Sergeyevich Valuev is a Russian politician and former professional boxer. He competed in boxing from 1993 to 2009, and held the WBA heavyweight title twice between 2005 and 2009. Standing at a height of 2.13 metres (7 ft) and a peak weight of 149 kilograms (328 lb), Valuev is best known for being the tallest and heaviest world champion in boxing history.

John Ruiz is an American former professional boxer who competed from 1992 to 2010, and held the WBA heavyweight title twice between 2001 and 2005. Ruiz is of Puerto Rican descent, and is the first Latino boxer to win a world heavyweight title.