After graduating, he attended Division I powerhouse Ohio State University, where he competed at 149 pounds in all of his 4 seasons.
2006-07
True Freshman: Earned All-American status after placing fourth at the NCAA tournament, becoming the second Buckeye to do so in their first year of competition. He also placed third at the Big Ten Championships, and defeated 3 ranked opponents at the tournament.[9]
2007-08
Sophomore: Became a two-time All-American placing eight at the NCAA championship. At the Big Ten's, he placed sixth and was the fifth seed.[9]
Senior: Palmer had the most success in his college career as he became the NCAA's tournament runner-up and champion of the Big Ten Conference before graduating.[10]
Over his career, Palmer compiled a 121–33 record and became a four-time NCAA Division IAll-American, one-time NCAA finalist and one-time Big Ten Champion. He defeated notable opponents such as future Olympic Gold Medalist and 2x NCAA Champion Jordan Burroughs, NCAA Champion and future Olympian Frank Molinaro, future NCAA Champion and MMA Fighter Bubba Jenkins, former NCAA Champion (later two-time) Brent Metcalf and University Freestyle National Champion Jason Chamberlain[11][12]
Palmer made his professional mixed martial arts debut on May 20, 2011. He began his career at 7-0 and won the Resurrection Fighting Alliance Featherweight Championship a little over two years after his debut.[15]
On June 21, 2014, Palmer faced Nick LoBasco at WSOF 10.[17] He won via rear naked choke submission in the first round.
On December 13, 2014, Palmer challenged Rick Glenn for the WSOF Featherweight Championship at WSOF 16.[18] He won via rear naked choke submission in the third round to become the WSOF Featherweight Champion.
On June 5, 2015, Palmer made his first defense of the WSOF Featherweight Championship at WSOF 21 against IFL and WEC veteran Chris Horodecki.[19] He won via neck crank submission in the first round to retain the WSOF Featherweight Championship.
On December 18, 2015, Palmer made the second defense of the WSOF Featherweight Championship at WSOF 26 against Alexandre Almeida.[20] He lost via unanimous decision.
On May 10, 2016, it was announced that Palmer will have a rematch against Alexandre Almeida for the WSOF Featherweight Championship at WSOF 32 on July 30, 2016 in the co-main event.[21] He won via unanimous decision to become a two time WSOF Featherweight Champion.
On June 30, 2016, Palmer fought Andre Harrison in for the first title defense of his second reign as champion at WSOF 35 in the co-main event. He lost the fight via unanimous decision.[22]
Professional Fighters League
After World Series of Fighting became the Professional Fighters League, Palmer next fought on November 2, 2017. He fought Steven Siler at Professional Fighters League: Fight Night where Palmer won the fight via unanimous decision.[23]
Palmer then competed in the inaugural season of the Professional Fighters League. He fought on at the first event of the new format at PFL 1 in the Featherweight division. On June 7, 2018, he faced Bekbulat Magomedov and won the fight by second round submission.[24] On July 19, 2018, Palmer fought Jumabieke Tuerxun at PFL 4. He won the fight by third round submission.[25]
In the fall of 2018, Palmer entered the PFL Featherweight tournament as the second seed. At PFL 8 on October 5, 2018, he defeated Max Coga by unanimous decision in the quarterfinal round and then rematched Andre Harrison and earned unanimous decision win in the semifinal round.[26]
Palmer fought another rematch against Steven Siler in the finals at PFL 11 on December 31, 2018. He won the fight via unanimous decision, winning the PFL Featherweight tournament and earning the $1 million cash prize.[27]
2019 Season
In the opening round of the second season of PFL, Palmer faced Alex Gilpin at PFL 2 on May 23, 2019. He won the fight via unanimous decision, collecting three regular season points.[28]
In the second round Palmer faced Luis Rafael Laurentino at PFL 5 on July 25, 2019. He won the fight via third-round TKO and advanced to the playoffs.[29]
Palmer next faced Alexandre de Almeida and Alex Gilpin at PFL 8 on October 17, 2019. He won both fights by unanimous decision. He was expected to face Daniel Pineda in the Featherweight tournament finals, but after Pineda failed a drug test after PFL 8, Palmer was set to face Alex Gilpin in the finals again.
Palmer and Gilpin faced each other for the third time during the season at PFL 10 on December 31, 2019. Palmer implemented his grappling-heavy fight style, winning the bout via unanimous decision and claiming his second PFL Featherweight tournament victory.[30]
2021 Season
Palmer was scheduled to face Jason Soares in the opening round of the third season on May 21, 2020.[31] However, the event was cancelled due to the COVID-19 pandemic.[32]
Palmer was scheduled to face Lazar Stojadinovic at PFL 4 on June 10, 2021.[35] However, on May 24, it was announced that Stojadinovic had to pull out of the bout and was replaced by Jesse Stirn.[36] A day before the event, Palmer was pulled and rescheduled to face Movlid Khaybulaev on June 25, 2021 at PFL 6.[37] He lost the bout via unanimous decision, eliminating Palmer from the playoffs for the first time in his PFL career.[38]
2022 Season
Palmer faced Chris Wade on April 28, 2022 at PFL 2.[39] He lost the bout via unanimous decision.[40]
Palmer was scheduled to take part in the 2023 ACA Featherweight Grand Prix, facing Bibert Tumenov in the quarter-finals on August 11, 2023 at ACA 161. However, Palmer withdrew from the fight due to injury and the bout was postponed for the following event on September 2, 2023 at ACA 162.[43] At weigh-ins, Palmer (148 lbs / 67.1 kg) missed weight and was fined a 30% of his purse with went to his opponent.[44] He subsequently lost the bout via knockout at the end of the first round.[45]
Moving up to Lightweight, Palmer faced Alexey Polpudnikov on May 17, 2024 at ACA 175: Gordeev vs. Damkovskiy, losing by TKO stoppage in the second round.[46]
