Lomachenko, clearly believing he needed the final round, had a big 12th round, in which he clearly hurt Salido with body shots and to the head and brought the fight to an exciting conclusion.
"I was hurt very badly in the 12th round," Salido said. "He caught me with a very bad body shot. It was a matter of survival. It was preparation that got me through the round. I made sure he didn't land a liver punch."
Lomachenko wanted to fight for a world title in his pro debut, but that was not possible. However, Top Rank promoter Bob Arum promised him he would get him a shot in his second fight as long as he won his October pro debut, which he did against fringe contender Jose Ramirez by fourth-round knockout.
That set the stage for him to challenge Salido, who had won a vacant title on the same card on which Lomachenko made his pro debut, although some consider him to have already had a handful of pro fights because of his stint in the World Series of Boxing. The WSB is league format promotion run by the same AIBA organization that oversees the Olympic tournament. Fighters in the WSB retained the amateur eligibility.
Lomachenko was seeking to win a world title in his second pro fight, which would break the record set by Thailand's Saensak Muangsurin, who won a junior welterweight world title in his third pro fight in 1975.
In the fourth fight of his comeback after three years in retirement, former unified lightweight titleholder Juan Diaz -- "The Baby Bull" -- routed Gerardo Robles of Mexico in their 10-round lightweight fight.
Fighting 200 miles from his hometown of Houston, Diaz moved a step closer to a significant fight with a near-shutout decision win on scores of 100-90, 99-91 and 99-91.
"It was an awkward fight because I'm always the shorter guy, but this time I fought a guy shorter than me," Diaz said. "But I got the left hook working. By the seventh round, he didn't want to trade [punches] with me. I thought I finished well, and I'm going to ask Top Rank to put me in a world-title fight. That's where I think I'm at."
Diaz used his left hook -- his best punch -- to pound Robles throughout the fight, which had the crowd cheering because of the constant action. Diaz was in control all the way and landed a lot of punches against the game Robles. Diaz battered Robles (16-13, 7 KOs), 31, with left hooks in the seventh round and punctuated it with a clean right hand. There were long stretches of toe-to-toe action.
"The Baby Bull" is hoping to make another run at a world title. Diaz (39-4, 19 KOs), 30, won a 135-pound world title in 2004 and made seven defenses, including unifying three of the major belts, and established himself as a consistently crowd-pleasing brawler before losing his belts to Nate Campbell via split decision in 2008.
Diaz retired in 2010 after a second loss to Juan Manuel Marquez -- and a third loss in four fights -- but came out of retirement last April, feeling hungry to box again.
• Blue-chip prospect featherweight Oscar Valdez (9-0, 8 KOs), the 2012 Mexican Olympian, stopped Samuel Sanchez (5-6-1, 5 KOs) of Dallas at 2 minutes, 20 seconds of the second round of their scheduled six-round fight. Valdez was taking it to Sanchez when he staggered him with a clean left hook, and referee Mark Calo-Oy stepped in to stop the bout. Sanchez complained bitterly about the stoppage.