Career
Rances has two brothers, Yan Barthelemy and Leduan Barthelemy, who are also professional boxers. Barthelemy was a standout amateur, competing in more than 200 fights and winning a Cuban junior national championship. Barthelemy defected to the United States prior to the 2008 Olympics.
Barthelemy would later become the #1 contender by defeating Fahsai Sakkreerin on June 21, 2013 by second round knockout.
He vacated his title in February 2015 in anticipation of moving up in weight category. In his next contest, fighting in the super lightweight division against Antonio DeMarco at the Metro-Goldwyn-Mayer Grand Garden Arena in Las Vegas, Nevada, on June 21, 2015, Barthelemy gained a convincing victory.
Barthelemy showed his versatility early, coming out orthodox before switching up to southpaw midway throughout the first round. Barthelemy scored a knockdown with a huge left in the fourth round, but DeMarco survived the round.