UFC 133: Evans vs. Ortiz was a mixed martial arts event held by the Ultimate Fighting Championship on August 6, 2011, at the Wells Fargo Center in Philadelphia, Pennsylvania, United States.

However, Jones later found out that he would no longer require surgery and instead made his first title defense against Quinton Jackson on September 24, 2011, at UFC 135.

[7] On July 12, Phil Davis pulled out of his main event bout with Rashad Evans due to a knee injury suffered during training.

[12] The organization briefly turned their attention to matching Evans with Vladimir Matyushenko, who was already scheduled to compete on the card.

[17] However, Aldo was sidelined until October recovering from various injuries, while Mendes remained on the card and faced Rani Yahya.

Riki Fukuda was scheduled[19] to face Rafael Natal, but was forced out of the bout due to a knee injury suffered sustained in a car accident[20] and was replaced by Costas Philippou.