Joel Casamayor Johnson (born July 12, 1971) is a Cuban American former professional boxer who competed from 1996 to 2011.

Later that year, he won the WBA Super Featherweight title by stopping Jong-Kwon Baek in 5 rounds.

After the disputed loss to Castillo, Casamayor's career appeared to be in a downward spiral and he was set up with undefeated rising prospect Almazbek Raiymkulov in June 2005.

He defended the interim championship as well as The Ring's title against Jose Armando Santa Cruz on November 11, 2007 and won a controversial split decision.

On March 22, 2008, in a great battle, Casamayor became the first man to defeat the Australian Katsidis when he won the fight with a TKO in the 10th round.

With the win, Casamayor retained his Ring Magazine world title and added the WBO interim championship to his collection.

Two minutes into the eleventh round, Casamayor was knocked down by a right hand as he pulled away from an intense exchange.

[4] Casamayor fought Mexican American Robert Guerrero at the Mandalay Bay in Las Vegas, on July 31, 2010.

In the last minute of the final round, the Cuban engaged on the offensive, with Guerrero being knocked down for the first time in his professional career.