He defeated Thiago Tavares, in a preliminary bout at UFC 88: Breakthrough. Pellegrino bloodied Tavares' face in the first round and went on to win by a unanimous decision (29–28, 29–27, 29–27). There was a small controversy in the fight, as it appeared that Tavares submitted to an armbar in the second round, but the referee did not stop the bout, causing boos from the audience. The fight was awarded "Fight of the Night" honors and was voted by UFC as the #2 best fight of 2008.