But Silva's not the only champion in action.
The co-main event features former UFC lightweight belt holder Frankie Edgar, who will fight for just the second time since dropping down to the featherweight division.
In his debut, Edgar dropped a well-fought decision to champion Jose Aldo. As such, he is now a loser in three straight, though all three were title bouts. Saturday night, he'll participate in a non-title match for the first time in more than three years when he faces 23-year-old young buck Charles Oliveira.
Here's a round-by-round recap of the co-main event action as it unfolds from Las Vegas.