A press conference will be held to announce the fight on Wednesday in The Fourm Club at The Forum, which is now owned by Madison Square Garden and recently underwent a $40 million facelift.
"The fight is done, and it's going to be in a beautiful building, the way that they've refurbished it," said Top Rank CEO Bob Arum. "It has a great history in Los Angeles as the home of boxing for many years, and it's a very important building for Marquez because he got his start there."
A four-division titlewinner who who turns 41 in August, Marquez (55-7-1, 40 knockouts) went 12-0 with nine knockouts at The Great Western Forum. The run started with a first-round stoppage of Martin Ochoa in January 1995 that made Marquez 9-1 with seven knockouts following his American debut.
A loser of his professional debut by disqualification, Marquez was 29-1 with 22 knockouts after his final bout at The Great Western Forum — a second-round knockout of Wilfredo Vargas.
Marquez lost his 31st fight by unanimous decision to Freddy Norwood at The Mandalay Bay Hotel in Las Vegas, representing a failed bid to win the WBA 126-pound belt in September 1999.
"Marquez fought there regularly," said Arum. "That's what has helped to make him the attraction and the fighter that he is."
Marquez was last in the ring for a split-decision loss to Bradley last October, which followed his sixth-round stoppage of Pacquiao in December 2012.
Marquez's ultimate goal is a showdown with Bradley, a split-decision winner over Pacquiao in June 2012, or Pacquiao, against whom Marquez is 1-2-1. A win over either would make Marquez the first Mexican fighter to earn a fifth belt in as many different weight divisions.
A 33-year-old from Denver, Alvarado (34-2, 23 KOs) is 1-2 over the course of his past three fights, all of which happened as a junior welterweight.
Alvarado was stopped in the seventh round by Brandon Rios in Oct. 2012, won their rematch for the WBO's vacant 140-pound belt by unanimous decision last March, and then lost the title by tenth-round knockout to Ruslan Provodnikov last October.
Juan Manuel Marquez at The Great Western Forum
Martin Ochoa TKO 1 Jan. 30, 1995
Julio Sanchez Leon UD 10 April 4, 1995
Julio Cesar Portillo KO 6 July 10, 1995
Miguel Rodriguez TKO 1 Sept. 25, 1995
Julian Wheeler TKO 10 Nov. 6, 1995
Hector Ulises Chong KO 4 March 4, 1996
Freddy Cruz UD 10 July 8, 1996
Rodrigo Valenzuela RTD 8 Dec. 9, 1996
Agapito Sanchez UD 12 April 21, 1997
Catalino Becerra TKO 7 July 14, 1997
Luis Samudio TKO 9 March 16, 1998
Wilfredo Vargas KO 2 May 10, 1999
Total: 12-0, 9 knockouts