LAS VEGAS - Jose Aguiniga was forced to withdraw from his fight tomorrow night against Francisco Vargas at The Cosmopolitan of Las Vegas after he was rushed to the hospital this afternoon after collapsing in the gym apparently suffering from severe dehydration. The previously scheduled eight-round welterweight clash between Antonio Orozco and Jose Reynoso has been increased to a ten-round fight and moved up to the main event slot of tomorrow’s card which will be televised by FOX Sports Networks and FOX Deportes.

In previously announced bouts, Flint, Michigan’s Anthony Dirrell (24-0, 21 KO’s) battles Houston’s Don Mouton (11-6-1, 9 KO’s) in an eight-round light heavyweight co-feature and 2012 United States Olympians Joseph Diaz Jr. and Errol Spence Jr. return to the ring in a quest to remain perfect as professionals. Dallas’ Spence Jr. (4-0, 3 KO’s) faces Brandon Hoskins (16-4-1, 8 KO’s) Columbia, Missouri in a six-round junior middleweight bout while Joseph Diaz Jr. (3-0, 1 KO) of South El Monte, Calif. will take on Rio Piedras, Puerto Rico’s Eric Gotay (3-1, 1 KO) in a six-round junior featherweight battle.

In addition, the Cinco de Mayo weekend card will also feature 2012 United States Olympian Dominic Breazeale, Puerto Rico’s undefeated Carlos Velasquez and Los Angeles prospect Joet Gonzalez.

The night of boxing action, which will take place on the eve of the “MAY DAY: Mayweather vs. Guerrero” mega-event, is presented by Golden Boy Promotions and Mayweather Promotions and sponsored by Corona. Doors for the fights which take place in The Chelsea open at 6:00 p.m. PT and the first bell rings at 6:30 p.m. PT. The FOX Sports Networks and FOX Deportes bi-lingual simulcast will air live at 10:00 p.m. ET/7:00 p.m. PT. FUEL TV will rebroadcast the fight on July 21 at 12:00 p.m. ET/9:00 a.m. PT.

Ringside tickets are priced at $100 with reserved seating tickets priced at $60 and general admission tickets available for $30 and are available for purchase at www.cosmopolitanlasvegas.com or through Ticketmaster at (800) 745-3000 and www.ticketmaster.com. All event guests will have access to a new, socially dynamic nightlife experience curated by a live DJ, dancers and an interactive gaming pit.

Already 4-0 with four knockouts since turning professional last November following his participation in the 2012 Olympics, Anaheim’s Dominic “Trouble” Breazeale is back in action again on Friday, hoping to keep his knockout streak going when he takes on Hannibal, Missouri’s Lance Gauch (3-6-2, 3 KO’s) in a six-round bout to open the evening’s broadcast.

28-year-old Carlos Velasquez (14-0, 11 KO’s) made a triumphant return to the ring after a two-year layoff last November, scoring a near shutout decision win over Roberto Bonilla. Tomorrow, the Catano, Puerto Rico native is back to meet Miami’s Giorgi Mtchedlishvili (8-4-1, 1 KO) in a six-round junior lightweight battle.

Opening the show, junior featherweights Joet Gonzalez (3-0, 1 KO) of Los Angeles and Alex Chavez (1-0) of San Fernando, Calif. meet in a four round matchup.