It seems as if Anderson Silva is simply never challenged inside the Octagon.
Except for one night, in August of 2010 in Oakland, California, that all changed.
Chael Sonnen was 1:50 away from being the new UFC middleweight champion, and the one to dethrone Anderson Silva as the pound-for-pound king.
Unfortunately for Chael, he was caught in a triangle-armbar and was forced to submit.
Since that time, Chael has been out of action, dealing with legal problems, while Anderson has defended his middleweight title twice, making it look easy both times.
Anderson most recently defend his title Saturday night against Yushin Okami.
Chael is now set to return to the Octagon at UFC 136 against Brian Stann in a No. 1 contender match.
Here are five reasons why Anderson Silva will fight Chael Sonnen next.