Professional career

Diaz accumulated an undefeated record of 26-0 before losing to Kendall Holt by TKO in the 8th round. He defeated José Armando Santa Cruz for the interim title on August 12, 2006. On February 20, 2007, Diaz was awarded the title when Joel Casamayor, the champion at the time, was stripped of the title for signing to fight a rematch against WBO champion Acelino Freitas rather than defend against him - it should nevertheless be noted however, that the lightweight title bout between old foes Casamayor and Freitas never took place because Freitas fought and lost his WBO title to WBA champion Juan Díaz instead.

Diaz defeated Mexican legend Erik Morales on August 4, 2007, by a controversial unanimous decision to defend his title. On June 28, 2008, Diaz lost his title to Manny Pacquiao in Las Vegas via 9th-round TKO earning Pacquiao his fifth world championship in five different weight divisions.

After a lay-off that saw Diaz out of the ring for over a year, he returned to face Jesús Chávez on September 26, 2009. He won the fight by majority decision.

On March 13, 2010, Diaz challenged Humberto Soto for his old WBC lightweight title, which had recently been vacated by Edwin Valero, on the undercard of Pacquiao's fight with Joshua Clottey. Soto defeated Diaz, dropping him in the opening and closing rounds, en route to a unanimous decision victory.

Amateur Highlights

• Member of the 1996 US Olympic Team as a Light Welterweight. His results were:
  • Defeated fan favorite Zab Judah (United States) twice within 8 days
  • Defeated Jacobo Garcia (Virgin Islands) RSC 3 (0:33)
  • Lost to Oktay Urkal (Germany) 6-14
• Won Chicago Golden Gloves four times and the National Golden Gloves three times (1993, 1994 and 1996 National Golden Gloves light welterweight champion)
• Had a record of 78-16 in the amateurs

Professional record

Result	Opponent	Type	Round	Date	Location	Notes
Loss	Henry Lundy	TKO	6	2011-08-19	The Venue at Horseshoe Casino, Hammond, Indiana, United States
Win	Robert Frankel	RTD	5	2011-01-28	UIC Pavilion, Chicago, Illinois, United States
Loss	Humberto Soto	UD	12	2010-03-13	Cowboys Stadium, Arlington, Texas, United States	For vacant WBC lightweight title.
Win	Jesús Chávez	MD	10	2009-09-26	UIC Pavilion, Chicago, Illinois, United States
Loss	Manny Pacquiao	TKO	9	2008-06-28	Mandalay Bay Resort & Casino, Las Vegas, Nevada, United States	Lost WBC lightweight title.
Win	Ramon Montano	MD	10	2008-03-15	Mandalay Bay Resort & Casino, Las Vegas, Nevada, United States
Win	Erik Morales	UD	12	2007-08-04	Allstate Arena, Rosemont, Illinois, United States	Won WBC lightweight title.
Win	José Armando Santa Cruz	TKO	10	2006-08-12	Thomas & Mack Center, Las Vegas, Nevada, United States	Won interim WBC lightweight title.
Win	Cristian Favela	UD	12	2006-06-16	Cicero Stadium, Cicero, Illinois, United States
Win	Silverio Ortiz	UD	12	2006-03-17	Aragon Ballroom 1106 W Lawrence, Chicago, Illinois, United States
Draw	Ramazan Paliani	PTS	12	2005-12-10	Grand Victoria Casino, Rising Sun, Indiana, United States
Win	Juan Polo Perez	TKO	3	2005-10-21	Savvis Center, Saint Louis, Missouri, United States	Won vacant IBA Lightweight title.
Win	John Trigg	UD	4	2005-08-20	Allstate Arena, Rosemont, Illinois, United States
Win	Tyrone Wiggins	TKO	3	2005-06-02	Family Arena, Saint Charles, Missouri, United States
Loss	Kendall Holt	TKO	8	2005-02-04	Foxwoods Resort, Mashantucket, Connecticut, United States	Diaz down in round 1, Holt down in round 7.
Win	Jaime Rangel	TKO	9	2004-12-10	Aragon Ballroom, Chicago, Illinois, United States
Win	Jaime Morales	UD	8	2004-07-09	Star Plaza Theater, Merrillville, Indiana, United States
Win	Ener Julio	TKO	10	2004-05-15	DePaul Athletic Center, Chicago, Illinois, United States
Win	Emanuel Augustus	UD	8	2004-01-30	DePaul Athletic Center, Chicago, Illinois, United States
Win	Frankie Sanchez	UD	8	2003-12-12	DePaul Athletic Center, Chicago, Illinois, United States
Win	Juaquin Gallardo	UD	8	2003-09-13	Pechanga Resort & Casino, Temecula, California, United States
Win	Nelson Manchego	KO	1	2003-07-18	DePaul Athletic Center, Chicago, Illinois, United States
Win	Andre Baker	TKO	6	2003-06-06	Park West Theatre, Chicago, Illinois, United States
Win	Franco Ogentho	KO	1	2003-04-11	DePaul Athletic Center, Chicago, Illinois, United States
Win	Dillon Carew	TKO	3	2003-02-07	DePaul Athletic Center, Chicago, Illinois, United States
Win	Damone Wright	TKO	4	2002-12-13	DePaul Athletic Center, Chicago, Illinois, United States
Win	Clifton Woods	TKO	2	2002-10-17	Ambassador Club, Saint Louis, Missouri, United States
Win	Anthony Cobb	TKO	6	2002-09-27	DePaul Athletic Center, Chicago, Illinois, United States
Win	Steve Larrimore	TKO	2	2000-09-08	Chicago, Illinois, United States
Win	Mark Tang	TKO	3	1999-09-09	Noa Noa, Stone Park, Illinois, United States
Win	Rafael Salas	TKO	4	1999-04-21	Ramada Inn, Rosemont, Illinois, United States
Win	Adam Leibowitz	TKO	6	1999-02-27	Miccosukee Indian Gaming Resort, Miami, Florida, United States
Win	George Kellman	UD	6	1998-12-19	Miccosukee Indian Gaming Resort, Miami, Florida, United States
Win	Alberto Sepulveda	SD	6	1998-05-05	Grand Casino, Biloxi, Mississippi, United States
Win	Theon Holland	TKO	4	1998-03-14	Trump Taj Mahal, Atlantic City, New Jersey, United States
Win	Eduardo Castillo	UD	6	1997-11-15	Spotlight 29 Casino, Coachella, California, United States
Win	Daniel Hernandez	UD	4	1997-09-13	Thomas & Mack Center, Las Vegas, Nevada, United States
Win	Troy Crain	UD	6	1997-06-15	Grand Casino, Biloxi, Mississippi, United States
Win	Jesse Berry	UD	4	1997-02-22	Mohegan Sun Casino, Uncasville, Connecticut, United States
Win	Mark Andreske	UD	4	1997-01-10	Mohegan Sun Casino, Uncasville, Connecticut, United States
Win	Marcos Antonio Rodriguez	UD	4	1996-11-30	Tingley Coliseum, Albuquerque, New Mexico, United States	Professional debut.

Community

Diaz is involved with mentoring various youth. He is also active in the Mexican-American community of Chicago. In September 2013, he was the Grand Marshal of the 26th Street Mexican Independence Parade in the Pilsen neighborhood of Chicago. Earlier in that very same year on February 28, 2013, Diaz endorsed friend and former boxer Bill Evans as a candidate for Cook County Sheriff in 2014.

[ Source: Wikipedia ]