Roberson was called on short notice to fight K-1 legend Jérôme Le Banner at Fight Night Saint-Tropez 4 on August 4 in Saint-Tropez on his retirement fight. Although he was making his professional kickboxing debut, with only three amateur fights, he managed to upset Le Banner and score two knockdowns, first was ruled as a slip and during the second the referee proceeded with a slow count about 30 seconds that allowed him to recover, leading the fight to a controversial decision loss.
After earning three wins in amateur MMA, Roberson made his professional MMA debut May 2015. He fought sporadically over the next two years, obtaining a record of 5–0.
He made his debut on November 11, 2017 against Darren Stewart at. He won the fight via rear-naked choke submission in the first round. Roberson faced Cezar Ferreira on May 12, 2018 at UFC 224. He lost the fight via technical submission in the first round. Roberson faced Jack Marshman on November 3, 2018 at UFC 230. He win the fight via unanimous decision. Roberson agreed on a short notice fight against Glover Teixeira in the light heavyweight division at on January 19, 2019. Roberson replaced Ion Cutelaba in the fight who had to pull out due to an injury. Despite hurting Teixeira with elbows early in the round, Roberson lost the fight in the first round by submission via arm triangle choke. Roberson was scheduled to meet John Phillips on July 13, 2019 at UFC on ESPN+ 13. However, it was reported that Phillips was pulled from the bout due to injury and he was replaced by Wellington Turman. Roberson won the fight via a controversial split decision. Roberson faced promotional newcomer Roman Kopylov on November 9, 2019 at UFC on ESPN+ 21. He won the fight via a submission in round three. Roberson was expected to face Makhmud Muradov on April 18, 2020 at UFC 249. However, Muradov was forced to pull from the event due to COVID-19 pandemic travel restriction, and Roberson was pulled from the event and was scheduled to meet Marvin Vettori on April 25, 2020. However, on April 9, Dana White, the president of UFC announced that this event was postponed to a future date Instead Roberson was scheduled to face Marvin Vettori on May 13, 2020 at UFC on ESPN 9. At the weigh-ins Roberson weighed in at 187.5 pounds, 1.5 pounds over the middleweight non-title weight limit of 186 pounds. He was fined 20% of his purse, which was given to opponent Vettori, and the match was to proceed at a catchweight. However, Roberson was removed from the fight due to rhabdomyolysis. The fight was rescheduled to June 13, 2020 at. At the weigh-ins on June 12, Roberson once again missed weight, weighing in at 190.5 pounds, 4.5 pounds over the non-title middleweight limit of 186 pounds. The bout proceed as a catchweight bout and Roberson was fined 30% of his purse. He lost the fight via a submission in round one.
