Johnson and Lamas win while controversy erupts at UFC on Versus 4

PITTSBURGH -- Michael Johnson, Ricardo Lamas and Charles Oliveira were early winners at UFC on Versus 4 on Sunday night, but one of the fight's results is still in question.

Johnson with quick win

In his first fight since losing in the finale of "The Ultimate Fighter," Michael Johnson put on a show in a first-round TKO of Edward Faaloloto. Though Faaloloto cut Johnson's eye early, he dominated most of the round with takedowns and strong ground and pound. Near the end of the round, Johnson clinched with Faaloloto, threw several knees and then knocked him to the ground with a big right. He followed up hammer fists until the referee stopped the bout at 4:42.

"It feels amazing after six months off to go in there and get a TKO. He's a tough guy. I knew he was going to bring it," Johnson said after the bout. "We were both fighting for a job or fighting for comfort. He came at me with a barrage, then I just took over."

Lamas shows off his striking

Ricardo Lamas won his UFC debut in impressive fashion, overpowering Matt Grice in the first round. Both fighters have a wrestling background, but much of the round was spent on their feet. Grice gave up a takedown, but it was in stand-up where Lamas shone. He wobbled Grice with a kick to the head, then followed up with a knee that staggered him. Finally, Lamas ended the bout and sent Grice to the canvas with a right hand at 4:41.

"I came into this fight wanting to mix it up. I think I had better standup and ground game. When I had the opportunity to take him down I did and when I had the opportunity to strike I did," Lamas said.

Oliveira vs. Lentz ends in controversy

An exciting bout between Charles Oliveira was marred by an illegal knee and poor refereeing. Oliveira won by submission, but the fight's result will be reviewed by the Pennsylvania State Athletic Commission due to an illegal knee.

Oliveira won the first round with strong striking. Lentz started with a quick takedown but had trouble with Oliveira's guard. When the fight returned to stand-up, Oliveira used knee after knee to control the bout. He knocked Lentz to the ground, and then jumped on top of him to sink in a guillotine. Lentz worked his way out of it, and then sunk in a guilllotine on Oliveira, who then worked his way out of it. Oliveira took over the round at the end when the bout went back to the ground. Oliveira threw short elbows until the round was stopped.

In the second round, Lentz took advantage of a flying knee by Oliveira to get a takedown, but that's where the fight went awry.

Oliveira hit Lentz with a knee while Lentz was on both of his knees. Though it appeared to be illegal, the fight was allowed to continue. Oliveira then took advantage, continued to hit Lentz and then sunk in a rear naked choke to stop the fight at 1:48.

The crowd in Pittsburgh erupted in boos and chants to protest the result, and an item was even thrown into the Octagon. UFC commentator Joe Rogan announced that the fight will be reviewed by the commission afterwards because of the illegal knee. Because the bout was stopped before the end of the second round and the knee was blatantly illegal, it will likely be turned into a no-decision.