Bellator Quayhagen made his professional and Bellator debut against
Cosmo Alexandre at
Bellator 52. Despite coming in as an underdog, Quayhagen won the fight via unanimous decision. Quayhagen was scheduled to face Quaint Kempf at
Bellator 61 on March 16, 2012. However, Kempf pulled out of the fight due to injury. Quayhagen instead faced Brenton Taylor in a rematch from a bout in November 2011. Quayhagen defeated Taylor via unanimous decision. Quayhagen faced
Cliff Wright at
Bellator 69 on May 18, 2012. Quayhagen won the fight via unanimous decision. Quayhagen was scheduled to face Guillaume DeLorenzi at
Bellator 76 on October 12, 2012. However, the bout was rescheduled for November 2, 2012 at
Bellator 79. The bout never materialized due to issues with Quayhagen's contract. A rematch with
Cosmo Alexandre took place on November 9, 2012 at
Bellator 80. Quayhagen suffered his first professional defeat via unanimous decision.
Fight Master: Bellator MMA Quayhagen appeared as one of the contestants on the first season of
Fight Master: Bellator MMA that debuted on
Spike TV in June 2013. Quayhagen faced fellow Bellator veteran
Chris Lozano in the entry round. After two rounds of fighting, Quayhagen lost the fight via unanimous decision, thus ending his run in the competition. ==Championships and accomplishments==