for from WSOF which is the release for [Melvin]... Should have a new home for him shortly". Bellator MMA On May 4, 2015, Bellator MMA president Scott Coker announced Melvin's signing in a press release, stating "We are excited to have Melvin coming onboard." In his debut fight for the promotion, Guillard was given the chance to face a hand picked opponent and chose Brandon Girtz, who he fought at Bellator 141 on August 28, 2015. His decision to face Girtz ended up backfiring on him as he lost the fight via split decision. In his second fight for the promotion, Guillard faced Derek Campos on February 19, 2016 at Bellator 149. He lost the fight via knockout in the second round. In his third fight for the promotion, Guillard faced David Rickels on July 21, 2016 at Bellator 159. Guillard earned his first win in Bellator via a series of elbows and punches to defeat Rickels via KO in the first round. The win was overturned after Guillard tested positive for a non-performance-enhancing banned substance. Guillard was subsequently suspended for one year by the Kansas Athletic Commission. After agreeing to enter rehab and completing the program, Guillard's suspension was subsequently reduced to six months. Guillard faced Chidi Njokuani in the main event at Bellator 171 on January 27, 2017. He lost the fight by unanimous decision. Rizin FF In July 2018, Guillard faced Takanori Gomi at Rizin 11. He missed weight for the fight and lost by knockout at 2:33 in the first round. Guillard alleges that Rizin officials altered the rules of his match before the fight, telling him that for his match he would not be allowed to use either soccer kicks or knees to the head of a grounded opponent, forcing to him to change his planned strategy and his attire, putting on wrestling shoes. Guillard suspects that individuals were trying to possibly 'protect' Gomi. Regional promotions After the lone bout in Rizin, Guillard faced Terry House Jr. at United Combat League 32 on October 18, 2019. He lost the fight via unanimous decision. Guillard was next expected to face Erick Lozano at Lights Out 7 on February 8, 2020. However, the bout never materialized due to unknown reasons. Bare Knuckle Boxing BKB On April 22, 2017, Guillard took part in a bare knuckle boxing event for Bare Knuckle Boxing in England. He faced Dan Breeze