Middleweights Chael Sonnen and Michael Bisping fight at tonight's UFC on Fox 2 in Chicago, Illinois' United Center. Despite a relatively restrained build to the fight by the standards of these two outspoken athletes, the tension is definitely building as seen in this video after yesterday's weigh-ins.

Sonnen has been wearing a fake UFC belt he acquired somewhere and claiming to be the real champion. Bisping has been outspoken about Sonnen's use of testosterone replacement therapy (TRT) and has claimed Sonnen needs it because he has only one testicle.

The winner of the #1 contender's bout is expected to face middleweight champ Anderson Silva this summer in Brazil in what the UFC hopes will be their first stadium show in that country.

From Fuel TV:

UFC Tonight's Ariel Helwani nearly gets caught in the cross-fire. Can Sonnen and Bisping back up their smack talk in the Octagon at UFC on FOX: Evans vs. Davis? At least Bisping will never take away Chael's fake belt!