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The UFC made an aggressive match for Chris Daukaus, who until Dec. 1 was only a part-time fighter and a full-time Philadelphia police officer. On Saturday in the main event of UFC Fight Night, Daukaus will face Derrick Lewis , who in his last fight competed for the interim heavyweight title.

Daukaus resigned from the Philly PD to concentrate full-time on an MMA career. He’s 4-0 in the UFC with four knockouts, three of which have come in the first round.

Daukaus used to regard fighting as a side job and didn’t always put everything he had into it, MSN reports.

“Especially early in my career before I started taking this seriously, I’d skip training sessions for overtime or all these little things at work that would make me extra money,” Daukaus said. “It showed in my performances. I was getting overweight. I was sloppy with my technique. I wasn’t in the gym as much as I could have been or should have been.

“But now that I’m all in on this, I’m really excited to see what my body is able to put out and what I can do with my skillset.”

Daukaus has a black belt in Brazilian Jiu-Jitsu, but 11 of his 12 career wins have been by knockout. The other was by decision.

Daukaus has plenty of respect for Lewis as a fighter. Lewis has 20 knockouts among his 25 career wins and his 12 KOs in the UFC ties him with Matt Brown for the promotional record.