“It feels like I don’t have it in me anymore, to be honest,” Gustafsson said. “It feels like I do mistakes that I shouldn’t, so I just have the feeling it’s the time now. I don’t want to be a journeyman. I don’t want to do this because I’m getting paid. I just want to do this because I love it and I want to be at the top.”

If Gustafsson hadn’t submitted, he might have lost the bout anyways. Smith controlled the majority of the fight. But let’s look at some accomplishments of Gustafsson. He is one of 11 light heavyweights to win 10-plus fights. The only fighter in UFC history to land 100-plus strikes in two title fights and lose both (Jon Jones, Daniel Cormier). He has also recorded nine knockdowns in light heavyweight fights, 4th-most in division history.

Gustafsson finished his career 18-6 (10-6 UFC) and has lost two straight and four of his last six. With this retirement, expect Gustafsson to fix his home after putting his career first.