This fight could go in several directions, and it's the first fight in a long time where fans could make a strong argument for a winner on either side.
The reason for that is because there are questions left unanswered. Silva had an injured rib in their first fight at UFC 117, which many believe led to Sonnen's domination. But then again, Sonnen's pressuring style could be Silva's kryptonite.
Silva could come out more focused and more determined to knock out Sonnen early, or Sonnen could put Silva on his back and beat a hole in his face.
With so many intriguing elements surrounding the rematch, here's five ways this fight can go tonight.