Jameel McCline lost four attempts at the world heavyweight title to a boxer of what nationality?
Jameel McCline Jameel McCline (born May 20, 1970) is an American former professional boxer. He challenged for the world heavyweight title on an unprecedented four occasions, losing all four attempts to Wladimir Klitschko, Chris Byrd, Nikolai Valuev and Samuel Peter. Despite never winning a world title, McCline did defeat former champions and top contenders in Michael Grant, Lance Whitaker, Al Cole, and Shannon Briggs. McCline retired in 2012 at the age of 42.
Floyd Mayweather Jr. Floyd Joy Mayweather Jr. (born Floyd Joy Sinclair; February 24, 1977) is an American professional boxing promoter and former professional boxer. He competed from 1996 to 2007 and 2009 to 2015, and made a one-fight comeback in 2017. During his career, he held 15 world titles in five weight classes and the lineal championship in four different weight classes (twice at welterweight), and retired with an undefeated record of 50–0, surpassing Rocky Marciano's record of 49–0. As an amateur, Mayweather won a bronze medal in the featherweight division at the 1996 Olympics, three U.S. Golden Gloves championships (at light flyweight, flyweight, and featherweight), and the U.S. national championship at featherweight.