Early career Curtis amassed a record of 18–5 in the North American regional circuit while capturing Welterweight Championships in
CES MMA, Z Promotions and Premier MMA Championship.
Dana White's Tuesday Night Contender Series and first retirement Curtis was then invited to face Sean Lally at
Dana White's Contender Series 9 on June 12, 2018. He won the fight via third-round knockout but retired after he was not awarded a UFC contract. Curtis would however return to fight for the vacant Z Promotions Middleweight title against
Matt Dwyer on January 21, 2019, winning the bout via majority decision.
Professional Fighters League On April 1, 2019, it was revealed that Curtis would be participating
PFL 2019 season in the welterweight division. He was initially set to face
PFL Season 2018 Middleweight Champion Louis Taylor at
PFL 1 on May 9, 2019. However, Taylor was not able to get medically cleared and had to withdraw from the season, subsequently being replaced by
André Fialho. Curtis won the bout via third-round knockout. In the second regular season bout Curtis faced
PFL Season 2018 Welterweight Champion Magomed Magomedkerimov at
PFL 4 on July 11, 2019. He lost the fight via unanimous decision but advanced to the playoffs.
Playoffs, second and third retirement In the quarterfinals Curtis faced Magomedkerimov in a rematch at
PFL 7 on October 11, 2019. Again he lost the bout via unanimous decision, was eliminated from the season and retired from the sport. However, after their bout Magomedkerimov fell ill and Curtis ended his retirement by stepping in to replace Magomedkerimov against
Ray Cooper III in a semifinal bout. On April 14, 2020, it was announced that Curtis had come out of retirement and signed a multi-fight contract with ARES FC. He was scheduled to make his promotional debut against
Nassourdine Imavov at ARES FC 2 on April 3, 2020. However, the event was postponed due to the
COVID-19 pandemic to take place on October 30, 2020, before being cancelled altogether. Curtis was scheduled to face
Austin Vanderford on November 5, 2020, at
Bellator 251. However, Curtis had to pull out of the bout due to a positive COVID test and was replaced by Vinicius de Jesus. Curtis faced Kyle Stewart on January 30, 2021, at XMMA 1. He won the bout via TKO in the third round. After winning the next two bouts against Juan Ramon Grano Medina at iKon Fighting Federation 6 via first round TKO and Jarome Hatch at Fierce FC 15 via TKO stoppage in the third, Curtis faced
Kenny Robertson on July 30, 2021, at XMMA 2. He won the bout via unanimous decision.
Ultimate Fighting Championship Curtis was briefly expected to replace
Deron Winn against
Phil Hawes on day's notice at
UFC on ESPN 26 on October 9, 2021, but Hawes ultimately declined the bout. Nevertheless, the bout was later rebooked to take place at
UFC 268 on November 6, 2021. Curtis won the fight via first-round knockout. Replacing
Roman Dolidze on short notice, Curtis faced
Brendan Allen on December 4, 2021, at
UFC on ESPN: Font vs. Aldo. He won the fight via technical knockout in round two. The win earned him a
Performance of the Night bonus award. Curtis was then expected to face
Dricus Du Plessis at
UFC 273 on April 9, 2022. However, Curtis withdrew from the bout due to a wrist injury and was replaced by
Anthony Hernandez. Curtis then faced
Rodolfo Vieira at
UFC on ESPN: Tsarukyan vs. Gamrot on June 25, 2022. He won the fight via unanimous decision. Curtis faced
Jack Hermansson on July 23, 2022, at
UFC Fight Night 208, replacing the injured
Darren Till. He lost the fight via unanimous decision. Curtis faced
Joaquin Buckley on December 10, 2022, at
UFC 282. He won the fight via technical knockout in round two. This fight earned him another
Performance of the Night award. Curtis faced
Kelvin Gastelum on April 8, 2023, at
UFC 287. He lost the bout via unanimous decision. This fight earned him the
Fight of the Night award. Curtis faced
Nassourdine Imavov on June 10, 2023, at
UFC 289. The bout ended in a no contest in the second round after an accidental clash of heads left Curtis unable to continue due to a severe cut above his eye. Curtis was scheduled to face
Anthony Hernandez at
UFC Fight Night 227 on September 16, 2023. However, Curtis withdrew due to a rib injury and was replaced by
Roman Kopylov. Curtis faced
Marc-André Barriault on January 20, 2024, at
UFC 297. He won in a competitive bout by split decision. Replacing
Marvin Vettori, Curtis faced
Brendan Allen in a rematch on April 6, 2024, at
UFC Fight Night 240. Curtis lost the fight by split decision. Curtis was scheduled to face
Kevin Holland on October 5, 2024 at
UFC 307. However, Curtis withdrew from the fight due to a foot fracture and was replaced by
Roman Dolidze. Curtis faced
Roman Kopylov on January 11, 2025 at
UFC Fight Night 249. In a competitive bout, he lost the fight by a head kick knockout with one second left in the third round. This fight earned him another
Fight of the Night award. Curtis faced
Max Griffin in a return to the welterweight division on July 12, 2025 at
UFC on ESPN 70. He won the fight by split decision. Curtis faced
Myktybek Orolbai on March 14, 2026 at
UFC Fight Night 269. He lost the fight by unanimous decision. == Personal life ==