Early career (2009–2014) Cobb began
professional wrestling in 2009 training and working for Action Zone Wrestling in
Hawaii. He was given the name "Mr. Athletic". He won the AZW Heavyweight Title a record setting three times. He made appearances for many independent promotions in
Northern California such as
All Pro Wrestling, Supreme Pro Wrestling, Pro Wrestling Bushido, Fighting Spirit Pro, Phoenix Pro Wrestling and PREMIER Wrestling, where he held their heavyweight championship for 427 days. In September 2014, he received a tryout at the
WWE Performance Center.
Lucha Underground (2015–2019) Cobb signed to
Lucha Underground in 2015. He debuted for the promotion on March 22, 2016, under a mask and the ring name
"The Monster" Matanza Cueto, the storyline brother of
Dario Cueto, winning the
Lucha Underground Championship in his first match. Matanza remained undefeated until April 9, 2016, when he was pinned by
Rey Mysterio in an Aztec Warfare match, losing the
Lucha Underground Championship in the process. His character was killed off in the fourth season, which aired in 2018. Despite this, it was reported in April 2019 that Cobb was seeking legal action to be released from his Lucha Underground contract. This came after similar motions from others on the show, including
King Cuerno and
Joey Ryan. More days later, it would be confirmed that he had been released from the company.
Pro Wrestling Guerrilla (2016–2019) On May 20, 2016, Cobb made his debut for
Pro Wrestling Guerrilla (PWG), losing to
Chris Hero. On September 2, Cobb entered the
2016 Battle of Los Angeles, from which he was eliminated in the first round by
Ricochet. On December 16, 2016, Cobb and
Matt Riddle defeated
The Young Bucks. Cobb and Riddle were later known in PWG as "The Chosen Bros". On February 18, 2017, Cobb and Riddle would defeat the Unbreakable F'n Machines (
Brian Cage and
Michael Elgin). On March 18, 2017, the team would beat
OI4K (
Dave Crist and Jake Crist). On April 21, 2017, Cobb, in singles action, would defeat
Keith Lee. On May 19, 2017, The Chosen Bros defeated
reDRagon (
Kyle O'Reilly and
Bobby Fish). On October 20, The Chosen Bros defeated the Lucha Brothers (
Rey Fenix and
Penta el Zero M) to win the
PWG World Tag Team Championship. Cobb and Elgin did not get along behind the scenes with Elgin making disparaging remarks about his tag team partner in private messages that were made public while the tournament was still in progress. The two finished the tournament on December 9 with a record of four wins and three losses, failing to advance to the finals. On June 11, 2018, it was announced that Cobb would return to
New Japan Pro-Wrestling for Kizuna Road shows. On June 17, it was announced that Jeff Cobb would face
Hirooki Goto for his
NEVER Openweight Championship. He would go on to lose the match. Cobb spent the bulk of late 2018 participating in the
World Tag League tournament with partner
Michael Elgin, winning eight matches, but failing to qualify for the finals. On April 6, 2019, Cobb won the NEVER Openweight Championship in a
Winner takes all match against
Will Ospreay at
G1 Supercard. Cobb's
ROH World Television Championship was also on the line. Cobb would eventually lose the NEVER Openweight Championship to
Taichi in the first night of
Wrestling Dontaku 2019. Cobb then competed in his first
2019 G1 Climax Tournament where he finished with 8 points thus failing to advance to the finals. On November 6, 2019, Cobb was announced to be in one of the teams in the
2019 World Tag League Tournament with tag partner
Mikey Nicholls where they finished with 16 points failing to advance to the finals.
United Empire (2020–2025) In August 2020, Cobb competed in the
New Japan Cup USA where he defeated
Tanga Loa in the first round before losing to
Kenta in the semi-finals. Cobb was also announced to be competing in the
2020 G1 Climax tournament where he again finished with 8 points, failing to advance to the finals. It was also reported that Cobb had signed a contract with New Japan, officially joining the roster full time. He would join Will Ospreay's
United Empire stable (then known as the Empire) at the November 15 show, teaming with
Great-O-Khan in the annual
World Tag League thus turning heel in the process, though finishing the tournament with 10 points, failing to advance to the finals. At
Wrestle Kingdom 15 in Tokyo Dome he challenged
Shingo Takagi for the
NEVER Openweight Championship but lost the match. In March, Cobb would participate in the
New Japan Cup, he defeated
Satoshi Kojima in the first round, but was eliminated in the second round by
Evil. Over the next few months, Cobb would team with his United Empire teammates in tag team matches against
Los Ingobernables de Japon. Cobb began a short feud with
Kota Ibushi which culminated in a match between the two at
Dominion 6.6 in Osaka-jo Hall, which Cobb lost. Cobb then began a feud with
Kazuchika Okada, which started when Cobb pinned Okada in a tag match. The two would exchange losses and victories over the next few months, with Okada beating Cobb at
Wrestle Grand Slam in Tokyo Dome and Cobb defeating Okada at
Wrestle Grand Slam in MetLife Dome. In September, Cobb would enter the
G1 Climax 31 and would be in the B-block. During the tournament, Cobb would break records, defeating
Chase Owens,
Yoshi-Hashi,
Hirooki Goto,
Tama Tonga,
Taichi,
Sanada,
Hiroshi Tanahashi and Evil, therefore winning his first 8 consecutive G1 matches, the most consecutive wins in the tournament's history. However, on Night 18 in the B-block final, Cobb would lose to eventual G1 winner Kazuchika Okada, failing to advance to the tournament with 16 points, as Okada had also only lost one B-block match to Tama Tonga. On January 4 at
Wrestle Kingdom 16, United Empire defeated Los Ingobernables de Japon on night one, but Cobb would lose to
Tetsuya Naito on night two the following day. In March, Cobb would once again enter the
New Japan Cup. He defeated
Togi Makabe, Kojima and Yoshi-Hashi, but lost to Naito in the quarter final round. Cobb reshifted his focus to tag team competition with Great O-Khan who had been teaming with
Aaron Henare. On April 9, O-Khan and Cobb became the
IWGP Tag Team Champions for the first time in both men's careers, during the Hyper Battle series. The two lost the titles at
Wrestling Dontaku, ending their reign at 22 days. They regained the titles on June 12, at
Dominion 6.12 in Osaka-jo Hall. After losing the titles at
Forbidden Door, Cobb was announced to be a part of the
G1 Climax 32 in July at
Dominion 6.12 in Osaka-jo Hall, where he would compete in the A Block. Cobb finished the tournament with 6 points, failing to advance to the semi-finals. Later that year in October, Cobb participated in a tournament to crown the inaugural
NJPW World Television Champion, but was defeated by Yoshi-Hashi in the first round. The following month at
Battle Autumn, Cobb and O-Khan faced
FTR in a rematch for the IWGP Tag Team titles, but were defeated. On January 4 at
Wrestle Kingdom 17, Cobb competed in the
New Japan Rambo, but failed to last till the final 4. The following day at
New Year Dash!!, Cobb teamed with Aaron Henare in a losing effort to new
IWGP World Heavyweight Champion Kazuchika Okada and new
IWGP United States Heavyweight Champion Kenny Omega. In March, Cobb competed in the
New Japan Cup, receiving a
bye to the second round, where he was defeated by Evil. Later that month, Cobb defeated
Moose at
Multiverse United. In May at
Wrestling Dontaku, Cobb challenged
Zack Sabre Jr. for the NJPW World Television Championship, but the match ended in a time limit draw, causing Sabre Jr to retain the championship. A rematch was set up the following month at
Dominion 6.4 in Osaka-jo Hall, where Sabre Jr defeated Cobb. Later in the month, Cobb competed on the buy-in of
Forbidden Door, where he teamed with United Empire stablemates,
Kyle Fletcher and
TJP in a losing effort to Los Ingobernables de Japon members, Shingo Takagi,
Bushhi and
Hiromu Takahashi . The following month, Cobb competed in the annual
G1 Climax tournament, where he was placed into the D Block. Cobb finished with 9 points, narrowly missing out on qualifying for a quarterfinal spot. On May 3 at
Wrestling Dontaku, Cobb defeated Sabre Jr. to win the NJPW World Television Championship for the first time. On October 14 at
King of Pro-Wrestling Cobb lost the World Television title to Ren Narita in a 3-way match that also includes
Yota Tsuji. He would compete in a losing effort for the title again at
Wrestle Kingdom 19 in
Four-way match. On April 4 at
Sakura Genesis, Cobb and
Callum Newman defeated Tetsuya Naito and
Hiromu Takahashi to win the IWGP Tag Team Championship. On April 14, NJPW announced that Cobb would be leaving NJPW and the IWGP Tag Team Championship would be vacated, ending Cobb and Newman’s reign at 9 days. On April 19 during the
Road to Wrestling Dontaku tour, Cobb wrestled his final match in NJPW, losing to
Hiroshi Tanahashi. After the match, Cobb thanked NJPW, his United Empire stablemates, and the NJPW fans, officially ending his near 8-year tenure with the promotion.
Ring of Honor (2018–2020, 2022) On July 21, 2018, Cobb made his
Ring of Honor debut by attacking Eli Isom and FR Josie at a television taping. At
Death Before Dishonor XVI on September 28, Cobb confronted
Punishment Martinez following his defense of the
ROH World Television Championship. At a television taping the following night, Cobb, in his first official match, defeated Martinez to win the ROH World Television Championship. Cobb then would win both of his matches during the two-day
Glory By Honor XVI event in October, all three of his matches during the
Global Wars 2018 tour in November, and defeated
Adam Page at
Final Battle in December to round out the year. 2019 began with Cobb winning a four-way match at
Honor Reigns Supreme, and then winning all three of his matches (two of them being tag team matches) during the Road to G1 Supercard tour. At
ROH/NJPW War of the Worlds Night 2, Cobb would lose the World Television Championship to
Shane Taylor. After Cobb's contract ran out in 2020, Cobb stated he would still wrestle for ROH, albeit a lot less. In October 2020, his profile was moved to the alumni section. On December 10, 2022 at
Final Battle, Cobb returned to ROH, defeating
Máscara Dorada on the pre-show.
All Elite Wrestling (2020, 2022–2024) Cobb made his debut for
All Elite Wrestling (AEW) on the February 12, 2020 episode of
Dynamite, attacking
Jon Moxley alongside
The Inner Circle. He wrestled his AEW debut match on the following week's episode of
Dynamite, in a losing effort to Moxley. On the May 25, 2022 episode of
Dynamite, Cobb and
Great-O-Khan interrupted a match for the
ROH World Tag Team Championships, between
FTR and
Roppongi Vice attacking both teams, and raising the titles signaling their intentions of challenging for the championships. On the
June 15 episode of Dynamite, and after O-Khan and Cobb and the rest of
United Empire attacked both tag teams, Ospreay was announced to face
Orange Cassidy, whilst Cobb and O-Khan were placed into a triple-threat tag-team
Winner Takes All match for their newly won
IWGP Tag Team Championships and FTR's ROH World Tag Team Championships, along with Roppongi Vice at
Forbidden Door. At the event, Cobb and O-Khan both failed to capture the ROH World Tag Team Titles and lost the IWGP Tag Team Titles to FTR. On the March 29, 2023 episode of
Dynamite, he challenged
Kenny Omega for the
IWGP United States Heavyweight Championship, in a losing effort. On the May 15, 2024 episode of
Dynamite, Cobb teamed with
Kyle Fletcher, in a losing effort against
Blackpool Combat Club (
Bryan Danielson and Jon Moxley).
WWE (2025–2026) On May 10, 2025, Cobb made his
WWE debut at
Backlash, where he assisted
Jacob Fatu in retaining his
WWE United States Championship, establishing himself as a heel and joining
The Bloodline. The following week on
SmackDown, he was given the new ring name,
JC Mateo, and won his debut match against
LA Knight. On the July 4 episode of
SmackDown, the Bloodline was rebranded to the "MFT". On the March 20, 2026 episode of
SmackDown, Mateo defended the
WWE Tag Team Championship with stablemate
Tama Tonga on the
behalf of stable leader
Solo Sikoa, but the duo would lose the titles to
Damian Priest and
R-Truth. His final match took place on the April 24 episode of
SmackDown where he failed to regain the titles. Cobb was then released from WWE on May 2, amidst a wave of cuts by parent
TKO Group Holdings. After his release, journalist
Dave Meltzer reported on May 8 that Cobb was originally intended to have a singles push planned prior to signing in 2025, but it never materialized. ==Professional wrestling style and persona==