HBO has released two videos in advance of Saturday's bout between Juan Manuel Marquez and Mike Alvarado at The Forum in Inglewood, Calif., the winner of which will become mandatory challenger to WBO 147-pound titleholder Manny Pacquiao, who dethroned Tim Bradley for the belt by unanimous decision last month.

Click here for Road to Marquez-Alvarado.

A four-division titlewinner who who turns 41 in August, Marquez (55-7-1, 40 knockouts) went 12-0 with nine knockouts at the venue formerly known as the Great Western Forum. Now under the ownership of Madison Square Garden, The Forum recently underwent a $40 million facelift.

Marquez's run started with a first-round stoppage of Martin Ochoa in January 1995 that took Marquez to 9-1 with seven knockouts following his American debut.

Though losing 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 Resort and Casino in Las Vegas, representing a failed bid to win the WBA 126-pound belt in September 1999.

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 fifth bout with Pacquiao, who lost via split decision to Bradley in June 2012 and against whom Marquez is 1-2-1. A win over Pacquiao would make Marquez the first Mexican fighter to earn a fifth belt in as many weight divisions.

Click here for Marquez's greatest hits

Denver, Colorado's 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, 33, was stopped in the seventh round by Brandon Rios in October 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 January 30, 1995

Julio Sanchez Leon UD 10 April 24, 1995

Julio Cesar Portillo KO 6 July 10, 1995

Miguel Rodriguez TKO 1 September 25, 1995

Julian Wheeler TKO 10 November 6, 1995

Hector Ulises Chong KO 4 March 4, 1996

Freddy Cruz UD 10 July 8, 1996

Rodrigo Valenzuela RTD 8 December 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, nine knockouts