Tonight at the main event of UFC Fight Night, Ronaldo “Jacaré” Souza looked every bit the title contender that the UFC is touting him as.

Gegard Mousasi, who defeated Jacaré back when both fought for the Strikeforce promotion in 2008, was taken down repeatedly and pressured by the Brazilian’s potent jiu-jitsu attack en route to a third round submission.

Mousasi could afforded only a few meager jabs in response, and eventually succumbed to a guillotine choke.

The end came at 4:30 of the stanza, as Mousasi struggled to scramble to his feet after a typical Jacaré takedown. The Brazilian looped an arm around Mousasi’s neck and rocked back for the submission.

Jacaré advances his record to 21-3-1 with the victory. The former jiu-jitsu world champion is already ranked fourth in the UFC rankings, and looks to rise. He noted in a post fight interview that he had just scored a rare finish of Mousasi, who recent title challenger Lyoto Machida edged in five round decision.

Mousasi, who was born in Iran of Armenian parents but raised in the Netherlands, drops to 35-5-2 with the loss.

For full event coverage, please see UFC Fight Night results and play-by-play.

At UFC Fight Night, Ronaldo “Jacaré” Souza defeats Gegard Mousasi by submission (guillotine choke) at 4:30 of round three.