the fight via TKO due to punches near the end of the second round. Riddle was expected to face TJ Waldburger on December 11, 2010, at UFC 124. However, Waldburger was forced from the card with an injury and replaced by newcomer Sean Pierson. Pierson defeated Riddle via unanimous decision (30–27, 30–27, 30–27) and the bout was dubbed by president Dana White as the real Fight of the Night. Riddle was expected to face Ultimate Fighter castmate, Matt Brown, on March 3, 2011, at UFC Live: Sanchez vs. Kampmann, replacing an injured Mark Scanlon. However, Riddle was also injured, resulting in the Brown fight being removed from the card altogether. Riddle was expected to face T. J. Grant on June 26, 2011, at UFC on Versus 4. However, Riddle was forced from the bout with an injury and replaced by Charlie Brenneman. Riddle faced undefeated welterweight prospect Lance Benoist who had made his Octagon debut on September 17, 2011, at UFC Fight Night: Shields vs. Ellenberger. He lost the fight via unanimous decision in a bout that had earned Fight of the Night honors. Riddle was expected to fight Luis Ramos on December 30, 2011, at UFC 141. However, the fight was called off as Riddle became ill and had to only pull out moments before the fight took place. Riddle was expected to face Jorge Lopez on February 4, 2012, at UFC 143, replacing an injured Amir Sadollah. However, Lopez was also forced out of the bout and replaced by newcomer Henry Martinez. Riddle won the fight via a split decision. The bout between Riddle and Ramos was rescheduled for June 22, 2012, at UFC on FX 4. However, Riddle was forced from the bout with another injury, and was replaced by Matt Brown. Riddle stepped in for Siyar Bahadurzada on short notice to fight Chris Clements at UFC 149. Riddle won the match after catching Clements in a standing arm-triangle choke, forcing him to submit at 2:02 in the third round. Riddle won a $65,000 Submission of the Night bonus. This also marked the first submission win of his professional career. On October 20, 2012, it was announced that Riddle had failed his post-fight drug test, testing positive for marijuana. Riddle was subsequently fined and suspended for 90 days, retroactive to July 21, 2012. His win over Clements was changed to a no contest. Riddle was originally expected