It wasn't a heck of a lot of fun to watch for most of its duration, perhaps both featherweights were feeling the pressure of being in the big league (or for Assuncao, returning to the bigs). Not that it was a desert unwatered by fistic action, just that the action came in bursts.
In the first round, Yagin's aggression took the form of some hard right hands while standing. Assuncao ate a couple but his unconventional new striking stance kept him out of Yagin's range for the most part. Assuncao took Yagin down and landed some sharp ground and pound to take the round.
In the second Yagin landed with the right again and threatened with a tight guillotine choke. Assuncao escaped and controlled position on the ground. When they returned to the fight Assuncao continued to circle away with his hands down and Yagin strolled after him rather than cutting off the cage.
Assuncao came out in the third and put the fight on ice with a take down and, once Yagin's obligatory very tight guilllotine attempt was evaded, a long hard session of ground and pound.