Rickels compiled an amateur record of 8-1, and made his professional mixed martial arts debut in February 2010. He won via first-round TKO and went on to compile an undefeated record of 5-0 before being signed by Bellator.
Bellator MMA
Rickels made his Bellator debut on April 9, 2011, at Bellator 40 where he defeated formerly undefeated Dylan Smith by a first-round triangle choke submission. Rickels next fought Strikeforce veteran Richard Bouphanouvong on May 7, 2011, at Bellator 43 where he won by triangle choke in round 2. After defeating Levi Avera with a third-straight win by triangle choke in Bellator in 2011, Rickels was featured in the in 2012. He faced Jordan Smith in the opening round of the tournament at and won via KO at just 22 seconds into the first round. In the semifinals at, Rickels faced Karl Amoussou. The bout was back-and-forth but in the end, Amoussou won the fight via controversial split decision, giving Rickels his first professional loss. Rickels returned to face Jason Fischer at. He won via unanimous decision. Rickels was picked to enter the Lightweight Season 8 Tournament where he defeated Lloyd Woodard in the quarterfinals at Bellator 87 via unanimous decision. Rickels was to face Russian prospect Alexander Sarnavskiy, but Sarnavskiy fractured his hand during his first fight and had to withdraw from the tournament. Rickels instead faced Jason Fischer in a rematch and won via unanimous decision. In the finals at Bellator 94, Rickels took on Saad Awad. He dropped Awad with a right hand at the very end of the second round, but Awad remained resting on his back instead of getting up to his corner, resulting in the referee declaring an end to the match, controversially making Rickels the winner by TKO. With the tournament win, Rickels faced undefeated 11-0 Bellator Lightweight ChampionMichael Chandler at. He lost the fight via knockout at just 44 seconds into the first round. In March 2014, Rickels entered into the, where he faced Patricky Freire in the opening round at Bellator 113. He lost the fight via knockout in the second round. Rickels faced Davi Ramos on October 24, 2014, at Bellator 130. He won the fight via unanimous decision. Rickels faced John Alessio at Bellator 139 on June 26, 2015. Rickels almost finished Alessio in the first round, but an unintentional illegal knee from Rickels landed on Alessio's head when he was down and prompted the referee to stop the fight. Alessio couldn't continue and the fight was overturned to a no contest. Rickels had a rematch with Michael Chandler on November 6, 2015, at Bellator 145. He lost the fight via TKO in the second round. Rickels faced Melvin Guillard on July 21, 2016, at Bellator 159. He lost the fight via knockout in the first round. However, the loss was overturned to a No-Contest after Guillard tested positive for a non-performance-enhancing banned substance. Rickels faced Aaron Derrow at Bellator 171 on January 27, 2017. He won the fight via TKO, due to punches in the third round. Rickels was expected to face Brennan Ward at Bellator 185 on October 20, 2017, however, an injury to Ward forced him out of the bout, and Rickels was removed from the fight card as a result. After an injury to Derek Anderson, Rickels stepped in as a replacement to face Adam Piccolotti at Bellator 189 on December 1, 2017. He won the 160 lb catchweight fight by unanimous decision. Rickels faced Michael Page on May 25, 2018, at Bellator 200. He lost the fight via verbal submission due to a punch in the second round. After his 23rd fight in Bellator on August 24, 2019, Rickels became a free agent.
Bare-knuckle boxing
On January 23, 2020, news surfaced that Rickels had signed with Bare Knuckle Fighting Championship and is expected to make his promotional debut on March 14, 2020 with opponent to be determined.
