Tito Ortiz, after first turning down the offer, has agreed to fight Rashad Evans on short notice at UFC 133 in Philadelphia on Aug. 6.
"I'm an average man with a monster heart," Ortiz wrote Wednesday night on his verified Twitter account @titortiz. UFC asked me for my help and I'm here for them. Just want to show my true character by stepping up."
Phil Davis was Evans' original opponent, but he pulled out of the bout with a knee injury. UFC president Dana White said Thursday that Davis won't be out for an extended period of time.
Ortiz is coming off his first victory in five years, a submission of Ryan Bader at UFC 132 on July 2. Evans hasn't fought since winning a decision over Quinton "Rampage" Jackson on May 29, 2010.
"If he Tito stays on this path, this new Tito is awesome," White said.
Lyoto Machida was also asked to fill in for Davis and fight Evans. White said Machida first accepted the bout, but his management wanted to renegotiate his deal.
"Lyoto Machida has been terrorizing me for a long time for a fight and saying he wanted a fight," White said. Then when he spoke to Machida's management, he was told "If you pay us Anderson Silva money we'll take this fight."
"I opted not to pay him Anderson Silva money and told him, 'When you accomplish all the things Anderson Silva has accomplished, we'll pay you Anderson Silva money.'"