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Ortiz replaces Phil Davis who pulled out of the fight this week with an injury. Lyoto Machida had agreed to step in, but late contract demands killed the bout.
Evans and Ortiz fought to a draw at UFC 73 in 2007. Referee John McCarthy deducted a point from Ortiz in the second round for grabbing the fence. Ortiz last fought at UFC 132, earning his first victory since 2005 over Ryan Bader. Evans hasn't fought since defeating Quinton Jackson in May of 2010.
UFC 133 takes place August 6 at the Wells Fargo Center in Philadelphia, Pennsylvania.