At UFC 131 Brock Lesnar will get a chance to become the No. 1 contender for the heavyweight title.
The only problem is he will have to go through Junior Dos Santos.
Dos Santos is 12-1 with eight knockouts.
Dos Santos has only went the distance once.
The two have traded wins back and forth on The Ultimate Fighter.
But many believe Brock Lesnar does not stand a chance come fight night. Here are five reasons why.