In 2010, Morono began competing in Legacy Fighting Championship amateur series, amassing a record of 3-0-1. Later that same year, Morono made his professional MMA debut, winning 21 seconds into the first round by armbar. On December 4, 2015, Morono won the Legacy Fighting Championship Welterweight Championship with a first-round guillotine choke over Derrick Krantz.
Ultimate Fighting Championship
Morono stepped in on just over a week's notice to face Kyle Noke replacing an injured Kelvin Gastelum at UFC 195. Morono was awarded a split decision victory. Morono was expected to face James Moontasri on October 15, 2016 at UFC Fight Night 97. However, the promotion announced on October 6 that they had cancelled the event entirely. In turn, the pairing was quickly rescheduled and eventually took place on December 17, 2016 at UFC on Fox 22. Morono won the fight by unanimous decision. Morono was expected to face Sheldon Westcott on February 4, 2017 at UFC Fight Night 104. However, Westcott pulled out of the fight in early January and was replaced by Niko Price. He lost the fight via knockout at the end of the second round; however this was later overturned to a no contest after Price tested positive for marijuana. Morono faced Keita Nakamura on September 23, 2017 at . He lost the fight by split decision. Morono faced Joshua Burkman on February 18, 2018 at UFC Fight Night 126. He won the fight via a guillotine choke submission in the first round. Morono faced Jordan Mein on July 28, 2018 at UFC on Fox 30. He lost the fight via unanimous decision. After the loss, Morono decided to change camps, joining Fortis MMA. Morono faced Song Kenan on November 24, 2018 at UFC Fight Night 141. He won the fight via unanimous decision. The win also earned him the Fight of the Night bonus. Morono faced Zak Ottow on March 9, 2019 at UFC on ESPN+ 4. He won the fight via verbal submission due to elbow strikes in the first round. Morono faced Max Griffin on October 12, 2019 at UFC on ESPN+ 19. He won the fight via unanimous decision. Morono was scheduled to face Dhiego Lima on February 8, 2020 at UFC 247. However on January 22, 2020, Lima was forced to withdraw from the bout due to a neck injury, and he was replaced by Kalinn Williams. He lost the fight via knockout in round one.
