Photos: Luis Ortiz Blasts Cojanu - Maidana, Barrios, Balderas Win

Staples Center, Los Angeles - Heavyweight southpaw Luis Ortiz (29-1, 25 KOs) returned to the ring with a resounding victory, scoring a devastating second round knockout (2:08) of former world title challenger Razvan Cojanu (16-4, 9 KOs)

Ortiz landed 42 percent of his power shots (eight of 19) while Cojanu landed just two of 13 (15%) in the short fight.

Ortiz was emotional after the fight. He told SHOWTIME's Jim Gray that just five days ago he learned doctors have found a cure for Epidermolysis Bullosa, a disease his daughter suffers from.

Both fighters were coming off losses in heavyweight world title fights. Ortiz was fighting for the first time since challenging Deontay Wilder in a 2018 Fight of the Year candidate. The 6-foot-4 Ortiz wasted little time knocking out the 6-feet-7½, 269-pound Cojanu, returning for his first fight since challenging then-WBO Heavyweight Champion Joseph Parker.

In the telecast opener, Mario Barrios (22-0, 14 KOs) remained undefeated recording his sixth straight stoppage with an eighth-round TKO of Jose Roman (24-3-1, 14 KOs) in a scheduled 10-round welterweight match. Each of the judges, as well as SHOWTIME expert scorer Steve Farhood, scored the fight 80-70 in favor of Barrios at the time of the stoppage as Roman's corner didn't answer the bell for the ninth round.

San Antonio's Barrios relied on effective body work in dominating the fight, connecting on 61 of his 133 body shots. He connected on 44 percent of his power punches (104/239) compared to 26 percent for Roman (34/132), who had just five body shots on the night.

Barrios, who suffered a cut above his left eye in the first round, sent Roman to the canvas at 1:15 of the fourth round with a strong right that dazed Roman, then a left hook that put Roman down for the seventh time in his career. Barrios ended the round with a flurry of punches that left Roman stunned.

The 23-year-old Barrios sent Roman down again with 1:38 remaining in the eighth round. Roman survived the round, but his corner refused to answer the bell and the fight was over.

It was a star-studded night at Staples as current and former world champions attended the fights, including Jarrett Hurd, Errol Spence Jr., Leo Santa Cruz, Abner Mares, Gervonta Davis and Adrien Broner.

Shawn Porter was also in attendance. It was recently announced that Porter and fellow former 147-pound world title holder Danny Garcia will square off against one another for the vacant WBC Welterweight World Championship live on SHOWTIME Saturday, Sept. 8 from Barclays Center in Brooklyn, N.Y.

In streaming coverage of live undercard fights on SHOWTIME CHAMPIONSHIP BOXING COUNTDOWN, undefeated super lightweight prospect Fabian Maidana (16-0, 12 KOs), the brother of former champion Marcos Maidana, recorded a seventh-round stoppage (2:32) against former world title challenger Andrey Klimov (19-5, 9 KOs).

Also on the live stream, 2016 U.S. Olympian and unbeaten prospect Karlos Balderas (6-0, 5 KOs) dominated 54-fight veteran Giovanni Caro (27-24, 21 KOs) scoring a stoppage at 2:09 of the fourth round in a scheduled six-round super featherweight bout.