Joseph Diaz

On May 9, 2015, Diaz defeated Giovanni Delgado via unanimous decision on the undercard of the Canelo Álvarez vs James Kirkland fight. He stepped up competition against veteran Rene Alvarado in a fight televised on HBO Latino in July 2015 and on December 18, Diaz Jr. defeated Hugo Partida and earned the WBC-NABF featherweight title. He has since successfully defended his title twice against Jayson Velez and Victor Proa.

Diaz made his professional debut in 2012 against Vincent Alfaro, winning by unanimous decision over four rounds and also scored a knockdown in the fourth. On February 2, 2013, Diaz would go on to fight Jose Ruiz of Puerto Rico and win by technical knockout (TKO).

Prior to the Olympic Trials, he was the two-time reigning national champion at bantamweight that included a win over Antonio Nieves. Diaz became the first American boxer to qualify for the 2012 Olympics by becoming a quarter-finalist at the 2011 World Amateur Boxing Championships, where he defeated both 2004 Olympic silver medalist Worapoj Petchkoom of Thailand and former world championship bronze medalist Óscar Valdez of Mexico but lost to Lázaro Álvarez. Díaz was the 2011 U.S. National Champion at Featherweight at the U.S. Olympic Training Center in Colorado Springs, Colorado. He fought in the 2010-11 World Series of Boxing

At the 2012 Summer Olympics he beat Pavlo Ishchenko, but ran into Alvarez in his second fight and lost again.

Joseph "JoJo" Pedroza Diaz Jr. (born November 23, 1992) is an American professional boxer who has held the IBF junior lightweight title since January 2020. At regional level, he held the WBC-NABF, and WBO-NABO featherweight titles between 2015 and 2018. As an amateur he competed at the 2012 Olympics as a bantamweight.