International Fight League Ellenberger suffered the first loss of his career by unanimous decision to
Jay Hieron in his IFL debut. In Ellenberger's second IFL appearance, he defeated Ben Uker by TKO in the second round at IFL: Championship Final. Ellenberger filled in on short notice for an injured
Rory Markham and represented
Pat Miletich's
Quad City Silverbacks at the 2007 Team Championship Final. He suffered his only submission loss to
Brazilian jiu-jitsu black belt Delson Heleno. In his last fight for the promotion, Ellenberger dominated his opponent,
Pat Healy over three rounds to win a unanimous decision at IFL: Las Vegas.
BodogFight At the event entitled Clash of the Nations, held in
St. Petersburg, Russia, Ellenberger lost a unanimous decision to UFC veteran Derrick Noble. He then traveled to Costa Rica and defeated another UFC veteran, Zach Light, via
TKO at Costa Rica Combat. In his last appearance with BodogFight, Ellenberger knocked out Jose Landi-Jons in just nine seconds.
M-1 Challenge Ellenberger represented the United States at M-1 Challenges in Japan and South Korea. In his first bout held in Japan, Ellenberger defeated Frenchman Farouk Lakebir by unanimous decision. In his next fight, held in Korea, Ellenberger defeated Doo Won Seo via TKO in round two.
Bellator Ellenberger won his fight against Marcelo Alfaya at
Bellator 11 by knockout just 42 seconds into the first round.
Ultimate Fighting Championship Ellenberger stepped in on short notice for an injured
Chris Lytle and lost a split decision in his promotional debut at
UFC Fight Night 19 against
Carlos Condit. Ellenberger rebounded by defeating
Mike Pyle via second-round TKO on January 2, 2010, at
UFC 108. Ellenberger was set to face
Ben Saunders at
UFC 111 in
Newark, New Jersey as a replacement for the injured
Martin Kampmann; however, once
Jon Fitch's original opponent,
Thiago Alves, was forced out due to a brain irregularity, Saunders requested and was granted a fight against Fitch instead. Due to the last minute switch, Ellenberger was still paid win and show money. Ellenberger defeated
John Howard via third-round TKO at
UFC Live: Jones vs. Matyushenko. Ellenberger caused Howard's left eye to close after repeatedly landing short elbows and punches from the closed guard. Ellenberger was expected to face
Jon Fitch on February 5, 2011, at
UFC 126, but Fitch was pulled from the bout in favor with a matchup with
B.J. Penn at
UFC 127. Ellenberger instead faced the then-undefeated
Carlos Eduardo Rocha at UFC 126 and won the fight via split decision. Ellenberger faced
Sean Pierson on April 30, 2011, at
UFC 129, replacing an injured
Brian Foster, and won the fight via first-round KO on 17 days notice. Ellenberger faced
Jake Shields on September 17, 2011, at
UFC Fight Night 25. He won the fight via TKO only 53 seconds into the first round. The finish earned him a $55,000
Knockout of the Night award. A bout between Ellenberger and
Diego Sanchez was briefly linked to
UFC 141. However, a lingering hand injury ended up keeping Sanchez out of action until February 2012. The Ellenberger/Sanchez bout took place on February 15, 2012, at
UFC on Fuel TV 1 Ellenberger defeated Sanchez via unanimous decision, in a bout that earned both fighters
Fight of the Night honors. Ellenberger lost to
Martin Kampmann via second-round KO (knees) on June 1, 2012, at
The Ultimate Fighter 15 Finale. Ellenberger was expected to face
Josh Koscheck on September 1, 2012, at
UFC 151. However, Koscheck pulled out of the bout citing a back injury and was replaced by returning UFC veteran
Jay Hieron. Hieron gave Ellenberger his first loss six years earlier. After the UFC 151 event was cancelled, Ellenberger/Hieron took place on October 5, 2012, at
UFC on FX 5. Ellenberger won the fight via unanimous decision (29-28, 29–28, 29–28). Ellenberger was expected to face
Johny Hendricks on March 16, 2013,
UFC 158. However, Hendricks was pulled from the Ellenberger bout in favor of a matchup with
Carlos Condit at the event after Condit's original opponent
Rory MacDonald, pulled out of the bout with an injury. Ellenberger instead faced returning veteran
Nate Marquardt. Ellenberger defeated Marquardt via spectacular first-round knockout. The win also garnered him his second
Knockout of the Night bonus. Ellenberger faced
Rory MacDonald on July 27, 2013, at
UFC on Fox 8. MacDonald was able to use his size and reach advantage to repeatedly land his jab, neutralizing the shorter Ellenberger, resulting in a unanimous decision victory. UFC president Dana White criticized the performance as "lackluster". Ellenberger was expected to face
Tarec Saffiedine on January 4, 2014, at
UFC Fight Night 34. However, in late November, Ellenberger pulled out of the bout citing a hamstring injury and was replaced by
Hyun Gyu Lim. On April 9, 2014, Ellenberger revealed that he had signed an eight-fight contract with UFC with disclosed title clauses should he be a champion in the future. The bout with Saffiedine was rebooked for
UFC 172. However, on March 28, 2014, Saffiedine pulled out of the fight with an undisclosed injury. Ellenberger instead faced
Robbie Lawler at
UFC 173 on May 24, 2014. He lost the fight via TKO in the third round due to a combination of a knee and punches. Ellenberger next faced
Kelvin Gastelum on November 15, 2014, at
UFC 180. He lost the fight via submission in the first round. Ellenberger faced
Josh Koscheck on February 28, 2015, at
UFC 184. Ellenberger won the fight via submission in the second round, his first submission victory in nine years. It also earned Ellenberger a
Performance of the Night bonus. Ellenberger faced
Stephen Thompson on July 12, 2015, at
The Ultimate Fighter 21 Finale. He lost the fight via KO due to a spinning hook kick and punches in the first round. Ellenberger faced
Tarec Saffiedine on January 30, 2016, at
UFC on Fox 18. He lost the fight by unanimous decision. Ellenberger faced
Matt Brown on July 30, 2016, at
UFC 201. He won the fight by TKO in the first round and also picked up a
Performance of the Night bonus. Ellenberger faced
Jorge Masvidal on December 3, 2016, at
The Ultimate Fighter 24 Finale. He lost the fight by TKO in the first round after his foot became entangled in the fence, rendering him unable to defend himself from Masvidal's strikes. Ellenberger faced
Mike Perry on April 22, 2017, at
UFC Fight Night: Swanson vs. Lobov. He lost the fight via KO (elbow) in the second round. Ellenberger was expected to face
Bryan Barberena on June 1, 2018, at
UFC Fight Night 131. However, on March 23, 2018, Barberena pulled out due to injury. He will be replaced by
Ben Saunders. Ellenberger lost by TKO after being dropped by knee to the body in the first round. The pairing with Barberena was rescheduled and took place on August 25, 2018, at
UFC Fight Night 135. Ellenberger lost the fight by TKO in the first round and subsequently announced his retirement from Mixed Martial Arts. ==Championships and accomplishments==