On Saturday, Chris Weidman will look to defend his middleweight title against Lyoto Machida, and Ronda Rousey will look to defend her title against Alexis Davis.
The next day, Frankie Edgar and BJ Penn will meet for the third time, following their coaching gig on The Ultimate Fighter.
Penn and Edgar first fought at UFC 112, where Edgar won Penn's lightweight title by unanimous decision. Penn was granted an immediate rematch, and Edgar won a second unanimous decision, and he was more dominant than the first fight.
After the second fight, Penn went 1-2-1 before semi-retiring in December 2012. Edgar would go 2-3-1, including a drop to the featherweight division.
Their fight on Sunday will be Penn's featherweight debut, while it will be Edgar's third outing in the division, as well as his third fight with Penn. Let's see who's got the edge in their trilogy fight.