Gustafsson retires after submission loss to Smith

Anthony Smith's place among the elite light heavyweights in the world is secure.

"Lionheart" went into Alexander Gustafsson's hometown and finished him via rear-naked choke submission at 2:38 of the fourth round Saturday in the main event of UFC Stockholm. It was the biggest win of Smith's 11-year career and arguably his best performance.

Afterward, Gustafsson took his gloves off and left them in the Octagon. He confirmed after the fight that he would be retiring.

"The show is over, guys," Gustafsson said.

Smith controlled the majority of the fight. He got the better of the first two rounds with a series of hard left hooks. Gustafsson seemed content to stay on the outside and wait for the…