Joseph is of Mexican descent.[2] He attended Kranz Intermediate at the age of 12–14. He is left-handed and fights southpaw. As a child he played baseball but took up boxing to learn self-defense. He is coached by his father.[3] He attended South El Monte High School.
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 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-NABFfeatherweight title.[7] He went on to defend the title multiple times, before challenging Gary Russell Jr. for the WBC featherweight title on May 19, 2018, at the MGM National Harbor in Oxon Hill, Maryland. Diaz was unsuccessful, losing a unanimous decision to scores of 117–111, 117–111, 115–113.[8]
Super featherweight
On January 30, 2020, Diaz defeated IBFsuper featherweight champion Tevin Farmer by unanimous decision with scores of 115–113, 115–113, and 116–112 to claim his first world title. After the fight, Diaz praised his opponent, saying "Tevin Farmer is a hell of a fighter, guys. I thank him for giving me this opportunity."[9]
Diaz's first defense of his IBF super featherweight title was scheduled for February 13, 2021 against Shavkat Rakhimov. However, he was stripped of the title when he missed weight, weighing 3.6 lbs over the 130 lb limit. As a result, the fight still went ahead, but Diaz was fined $100,000 for missing weight, which represented 20% of his purse. The money was split evenly between Rakhimov and the California State Athletic Commission.[10] They fought to a majority draw, with scores of 115–113 Diaz, 114–114, 114–114.[11]
Lightweight
Diaz vs. Fortuna
Following his draw with Shavkat Rakhimov, Diaz moved up to the lightweight division which he promised would be his best weight, where he fought Javier Fortuna for the vacant WBC interim lightweight title on July 9, 2021. Diaz was docked a point in the fourth round for hitting behind the head, but nonetheless emerged as the victor via unanimous decision, with scores of 117–110, 116–111 and 115–112.[12]
Diaz vs. Haney
On October 8, 2021, it was announced that Diaz would be defending his WBC interim lightweight title against its previous owner, undefeated Ryan García, in Los Angeles on November 27.[13] However, on October 15, Mike Coppinger of ESPN revealed that García had suffered a hand injury and that the fight would be postponed.[14] This led to back and forth on social media between Diaz and Devin Haney, the full WBC lightweight champion, culminating in an official announcement on November 3 that Diaz would now be challenging for Haney's full world title on December 4, instead of defending his interim title against García.[15]
Diaz vs. Duarte
On April 27, 2024 in Fresno, CA, Diaz is scheduled to face Oscar Duarte in a 10-round bout.[16]
Super Lightweight
February 15, 2024 in Commerce, CA, Diaz was scheduled to face Jesus Antonio Perez Campos at super lightweight.[17] He lost the fight by split decision.[18]
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José Pedraza González is a Puerto Rican professional boxer and former two-weight world champion. He held the IBO super featherweight title in 2014, the IBF super featherweight title from 2015 to 2017, and the WBO lightweight title in 2018. As an amateur he represented Puerto Rico, winning medals in multiple international competitions. Among the awards he achieved are a bronze medal at the 2007 Pan American Games, silver at the 2009 World Championships and gold at the 2010 Central American and Caribbean Games, as well as participation in the 2008 Summer Olympics. As of June 2021, he is ranked as the world's eighth best active super lightweight by BoxRec.
Miguel Angel Garcia Cortez, best known as Mikey Garcia, is an Mexican American former professional boxer who competed from 2006 to 2021. He held multiple world championships in four weight classes from featherweight to light welterweight, and challenged once for the IBF welterweight title.
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Léodegario Santa Cruz is a Mexican professional boxer. He is a four-weight world champion, having held the IBF bantamweight title from 2012 to 2013, the WBC super bantamweight title from 2013 to 2015, the WBA (Super) featherweight title twice between 2015 and 2022, and the WBA (Super) super featherweight title from 2019 to 2020.
Adrián René Granados is an American professional boxer.
Amanda Serrano is a Puerto Rican professional boxer, mixed martial artist and professional wrestler. As a boxer, she is the unified featherweight world champion, having held the WBO title since 2019, IBO title since 2021, IBF title since 2022 and the WBA title since 2023. She is the only female, and Puerto Rican, to win world titles in more than four weight classes, and holds the Guinness World Record for the most boxing world championships won in different weight-classes by a female, having held 9 major world titles across seven different weight classes.
Ash-Shakur Nafi-Shahid Stevenson is an American professional boxer. He has held multiple world championships in three weight classes from featherweight to lightweight, including unified and lineal titles at super featherweight. As an amateur, he represented the United States at the 2016 Summer Olympics, winning a silver medal in the bantamweight division. As of November 2023, he is ranked as the world's third best active lightweight by the Transnational Boxing Rankings Board and BoxRec, fourth by ESPN, and fifth by The Ring magazine.
Rey Geovani Vargas Roldán is a Mexican professional boxer. He is a world champion in two weight classes, having held the WBC featherweight title since 2022 and the WBC super bantamweight title from 2017 to 2020.
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Boxing in the 2020s is a list of notable fights and events in boxing during the decade from the year 2020 to 2029.
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