Liddell, but he was able to get up right away. Later in the second round as Couture moved in Liddell countered similar to in the second fight at UFC 52 knocking Couture out, defeating Couture for the second time via knockout in Las Vegas, Nevada, to retain the light heavyweight championship belt. After the fight, Couture announced his retirement from mixed martial arts. Liddell vs. Sobral II In his next defense, at UFC 62 on August 26, 2006, Liddell would beat Renato "Babalu" Sobral, who he had defeated nearly three years prior. Seconds after the fight started Sobral came running forward throwing punches. Liddell, moving backwards, was landing big punches, and a right uppercut ended the fight at 1:35 of the first round. It was announced during UFC 61 that, were he to defeat Sobral, Liddell would face off against PRIDE Middleweight Champion Wanderlei Silva. The fight failed to materialize due to the competing promotions' inability to reach an agreement. UFC president Dana White attributed this to Silva's subsequent knockout loss to Mirko Filipović. Liddell vs. Ortiz II In what was the most financially successful UFC event up to that point, Liddell fought a rematch with Tito Ortiz at UFC 66, which took place on December 30, 2006. Liddell's takedown defense neutralized Ortiz's wrestling ability, forcing Ortiz to stand up with a known striker. Although Ortiz did take Liddell down at one point in the fight, Liddell went on to defeat Ortiz via TKO in the third round to defend his light heavyweight championship successfully for a fourth time. It was later revealed that Liddell had torn his MCL prior to the fight. He had also popped the tendon out on the middle finger on his left hand during the fight itself. Title loss and decline Liddell vs. Jackson II In his fifth defense, Liddell would lose the title at UFC 71 on May 26, 2007, in a rematch with Quinton "Rampage" Jackson. Liddell was knocked down by a right hook less than two minutes into the first round and was unable to defend himself against Jackson's strikes on the ground, resulting in a knockout victory for Jackson. After the loss, Liddell was widely criticized after reports indicated he had been seen in night clubs the week before the event. He responded that it was not anything he had not done prior to his other fights in Las Vegas. Liddell