Moraes got his start in martial arts with Muay Thai at age seven and began training in Brazilian Jiu-Jitsu at age 15.[5] He saw national success in Muay Thai in his native Brazil, earning a pair of Muay Thai National Championships before switching full-time to MMA.[6]
Mixed martial arts career
Xtreme Fighting Championships
On December 2, 2011, Moraes fought Chris Manuel at XFC 15, winning via unanimous decision.[7]
On April 13, 2012, Moraes fought Jarrod Card at XFC 17, He won via knock out in 47 seconds of round one.[8]
On November 3, 2012, Moraes made his promotional debut against former WEC Bantamweight Champion Miguel Torres at WSOF 1.[10] Moraes defeated Torres via split decision.
Following Moraes's victory over Torres, it was announced that at WSOF 2 Moraes would face Tyson Nam. On March 23, 2013, Moraes defeated Nam via knockout due to a head kick and punches in the first round.[11]
Moraes faced Brandon Hempleman at WSOF 4 on August 10, 2013.[12] Moraes won via unanimous decision.
Moraes fought Carson Beebe at WSOF 6 on October 26, 2013.[13] He won via knockout due to punches in just thirty two seconds of round one.[14]
Moraes fought for the inaugural WSOF Bantamweight Championship against Josh Rettinghouse at WSOF 9.[15] He won via unanimous decision to become the first ever WSOF Bantamweight Champion.[16]
Moraes was scheduled to defend his title against Josh Hill on September 13, 2014, at World Series of Fighting 13. However, Hill was injured and replaced by Cody Bollinger, with the bout being changed to a non-title, catchweight affair.[17] Moraes won the fight via rear-naked choke submission in the second round.[18]
Moraes was once again scheduled to defend his WSOF Bantamweight Championship against Josh Hill. The rescheduled fight took place on February 12, 2015, at WSOF 18 in Edmonton, Alberta. Moraes won via unanimous decision to retain his WSOF Bantamweight Championship.[19]
Moraes faced Sheymon Moraes on August 1, 2015, at WSOF 22. Marlon Moraes won via rear naked choke submission in the third round to retain his WSOF Bantamweight Championship.[20]
On February 20, 2016, Moraes faced Joseph Barajas at WSOF 28. Moraes won via technical knockout due to leg kicks in the first round to retain his WSOF Bantamweight Championship.[21]
On May 10, 2016, it was announced that Moraes will rematch against Josh Hill for the WSOF Bantamweight Championship at WSOF 32 on July 30, 2016, in the main event. Moraes won the fight via knockout in the second round.[22]
Moraes defended his title against Josenaldo Silva at WSOF 34 on December 31, 2016. He won the fight via technical knockout due to Silva receiving a knee injury.[23]
On January 3, 2017, Moraes vacated the WSOF Bantamweight Championship after becoming an unrestricted free agent.[24]
Ultimate Fighting Championship
In April 2017, it was announced that Moraes had signed with the UFC.[25]
He made his promotional debut against Raphael Assunção at UFC 212 on June 3, 2017.[26] He lost the back-and-forth fight via split decision.[27]
Moraes made a quick return to the Octagon as he stepped in to replace Rani Yahya against Aljamain Sterling at UFC Fight Night: Swanson vs. Ortega on December 9, 2017.[30] He won the fight via knockout in the first round.[31] The win also earned Moraes his first Performance of the Night bonus award.[32]
After UFC Fight Night 123 in Fresno, the California State Athletic Commission (CSAC) flagged Moraes for gaining more than 10% of his weight back after weigh-ins. His jump from 135.4 pounds on weigh-in day to 155 pounds on fight day was a difference of 14.5%, well over commission regulations of staying within 10% of the contracted weight. CSAC will not license him for bantamweight bouts “without extensive medical documentation from a licensed physician certifying the weight class is appropriate and verified by CSAC physicians.”[33]
Moraes faced Jimmie Rivera on June 1, 2018, at UFC Fight Night 131.[34] Moraes won the fight via first-round knockout due to a head kick and punches in just 33 seconds, becoming the first fighter to finish Rivera in MMA, and snapping Rivera's 20-fight win streak. This win earned him a $50,000 Performance of the Night bonus.[35]
Moraes faced Raphael Assunção in a rematch on February 2, 2019, in the main event at UFC Fight Night 144. Their first fight ended in a split decision loss for Moraes at UFC 212 on June 3, 2017.[36] Moraes won the rematch in the first round by first dropping Assunção with two punches and then securing a guillotine choke submission.[37] This win earned him the Performance of the Night award.[38]
Moraes faced Merab Dvalishvili on September 25, 2021, at UFC 266.[48] Despite knocking Dvalishvili down twice and nearly finishing him in the first round, Moraes ultimately fatigued and lost the fight via second round TKO.[49]
On April 13, 2022, Marlon announced his retirement from MMA via his manager, Ali Abdelaziz. He stated that he wanted to “thank everyone- Sean Shelby, Dana White and the UFC for giving him the opportunity”.[52]
Professional Fighters League
Less than 6 months after announcing his retirement, Moraes announced that he would be signing with the PFL for the 2023 Featherweight tournament.[53]
Moraes was scheduled to face Shane Burgos in his PFL debut on November 25, 2022, at PFL 10.[54] However, Burgos withdrew from the bout due to an injury.[55] He was replaced by Sheymon Moraes.[56] He lost the bout in the third round via TKO stoppage.[57]
Moraes started the 2023 season against Brendan Loughnane on April 1, 2023, at PFL 1.[58] He lost the bout in the second round, after a barrage of leg kicks left him unable to continue to fight.[59]
Moraes was scheduled to face Alejandro Flores on June 8, 2023, at PFL 4.[60] After Flores had failed a commission drug test and was pulled from the season, he was replaced by Gabriel Braga.[61] Moraes lost the bout via technical knockout in the first round.[62] He announced his retirement during the post-fight interview.[63]
Retirement and law enforcement career
After announcing his retirement on June 8, 2023 after his knockout loss against Gabriel Braga, Moraes transitioned into a career in law enforcement. In May 2024, Moraes was sworn in as a police officer in Davie, Florida.[64]