LOS ANGELES - Oscar De La Hoya and Golden Boy Promotions hosted the official weigh-in for Saturday's stacked 10-fight card at StubHub Center in Carson, Calif. The first live bout is at 2 p.m. PT. Photos by Gene Blevins/Hoganphotos, Chris Farina/Top Rank.

In the main event of a tripleheader live on SHOWTIME® (10 p.m. ET/7 p.m. PT), former four-division world champion Robert "The Ghost" Guerrero (31-2-1, 18 KOs), of Gilroy, Calif., returns from a 13-month layoff to face offensive-minded, hard-hitting Yoshihiro Kamegai (24-1-1, 21 KOs), of Sapporo, Japan, in a 12-round welterweight bout. Guerrero came in at 146-pounds and Kamegai weighed in at 146.8

The co-feature on SHOWTIME CHAMPIONSHIP BOXING is a clash of exciting southpaws, undefeated yet untested Gary Russell Jr. (24-0, 14 KOs), of Capitol Heights, Md., against perhaps the most prolific amateur boxer of all-time, Vasyl Lomachenko (1-1, 1 KO), of Ukraine, in a 12-rounder for the vacant WBO Featherweight World Championship. Both Russell and Lomachenko came in at 125.4-pounds.

The telecast will open with former two-division world champion Devon Alexander (25-2, 14 KOs), of St. Louis, facing the always-dangerous Jesus Soto Karass (28-9-3, 18 KOs), of Los Mochis, Sinaloa, Mexico, in a 10-round super welterweight match. Alexander weighed in at 148.2-pounds and Soto Karass came in at 148.

Also on the card.

Former light heavyweight world champion, "Bad Chad" Dawson (31-3, 17 KOs), of Las Vegas by way of New Haven, Conn., makes his first start in 12 months when he takes on George "Honey Boy" Blades (23-5, 16 KOs), of Indianapolis, Ind., in the featured bout on SHOWTIME EXTREME® (8 p.m. ET/PT, delayed on the West Coast).

In a battle of U.S. Olympians in the SHOWTIME EXTREME co-feature, 2012 U.S. Olympian and undefeated heavyweight Dominic "Trouble" Breazeale (10-0, 9 KOs), of Los Angeles, makes his 10-round debut when he takes on 2004 U.S. Olympic team captain Devin "Devastatin'" Vargas (18-3, 7 KOs), of Toledo, Ohio.

In non-televised fights: Vyacheslav Shabranskyy (8-0, 7 KOs), Los Angeles, makes his debut for GBP against Michael Grenga (15-14, 15 KOs), Lagos, Nigeria, 6 rounds, light heavyweights; Sharif Bogere (24-1, 16 KOs), Las Vegas, Nev., faces a foe to be announced, 8 rounds, lightweights; Michael Hunter (4-0, 3 KOs), Van Nuys, Calif., takes on Jerry Forrest (7-1, 6 KOs), Lafayette, La., 8 rounds, heavyweights; the brother of Marcos "Chino" Maidana, Fabian Maidana (pro debut), Santa Fe, Arg., clashes with Alejandro Arteaga (3-8, 1 KO), Bakersfield, Calif., 4 rounds, welterweights; and Marcos Hernandez (1-0), Fresno, Calif., vs. Dante Spinks (0-4), San Diego, Calif., 4 rounds, super welterweights.