Jeffrey Cobb
Biography
Jeffrey Cobb is an American professional wrestler and former amateur wrestler best known for his eight-year run in New Japan Pro-Wrestling from 2017 to 2025, where he was a member of United Empire and became a one-time NEVER Openweight Champion, a one-time NJPW World Television Champion, and a three-time IWGP Tag Team Champion. Cobb made his G1 Climax debut in 2019, competed in six editions of the tournament, and opened the 2021 G1 Climax by winning his first eight matches, a feat unmatched in tournament history. He was ranked No. 23 in the PWI 500 by Pro Wrestling Illustrated in 2019 and won the Tokyo Sports Best Tag Team Award in 2022 alongside United Empire stablemate Great-O-Khan.
Outside of NJPW, Cobb wrestled in Lucha Underground from 2015 to 2018 as the masked wrestler Matanza Cueto, during which he held the Lucha Underground Championship, and also competed for Ring of Honor (ROH), where he won the ROH Television Championship, and Pro Wrestling Guerrilla (PWG), where he captured both the PWG World and World Tag Team Championships and won the 2018 Battle of Los Angeles.
As an amateur wrestler, Cobb represented Guam at the 2004 Summer Olympics, where he served as the nation’s flag bearer and competed in the men’s light heavyweight freestyle category before transitioning to professional wrestling in 2009.
He later signed with World Wrestling Entertainment (WWE) in May 2025, performing on the SmackDown brand under the ring name JC Mateo as part of The MFTs alongside Solo Sikoa, Tonga Loa, Talla Tonga, and Tama Tonga, before departing the company in 2026 following the expiration of his one-year contract.
Personal Info
Known For
Acting
Known Credits
255
Gender
Male
Birthday
1982-07-11
Place of Birth
Honolulu, Hawaii, U.S
Also Known As
Mr. Athletic, Monster Matanza Cueto, Jeff Cobb, El Jéfe Cobbo, Matanza Cueto, Matanza, X, JC Mateo
Known For
NJPW Wrestle Grand Slam in MetLife Dome: Night 2
NJPW G1 Climax 31: Day 2
NJPW G1 Climax 31: Day 4
NJPW G1 Climax 31: Day 6
NJPW G1 Climax 31: Day 8
NJPW G1 Climax 31: Day 10
NJPW G1 Climax 31: Day 14
NJPW G1 Climax 31: Day 12
NJPW G1 Climax 31: Day 16
NJPW G1 Climax 31: Day 18
NJPW G1 Climax 31: Day 19 (Final)
GCW Josh Barnett's Bloodsport 9
ROH: Supercard of Honor 2023: Zero Hour
IMPACT Wrestling x NJPW: Multiverse United: Only The Strong Survive
NJPW Dominion 6.6 in Osaka-jo Hall
Mark Hitchcock Memorial Wrestlecon Supershow 2023
NJPW Wrestle Kingdom 16: Night 1
NJPW Wrestle Kingdom 16: Night 2
NJPW Battle In The Valley 2021
NJPW Dominion 6.4 in Osaka-jo Hall
NJPW Sakura Genesis 2023
NJPW G1 Climax 32: Day 1
AAW Unstoppable 2016
NJPW G1 Climax 33: Day 4
NJPW G1 Climax 33: Day 6
NJPW G1 Climax 33: Day 8
NJPW G1 Climax 33: Day 10
NJPW G1 Climax 33: Day 2
NJPW G1 Climax 33: Day 12
NJPW G1 Climax 33: Day 16
NJPW G1 Climax 32: Day 2
NJPW G1 Climax 33: Day 14
NJPW G1 Climax 33: Day 13
NJPW G1 Climax 32: Day 4
NJPW G1 Climax 33: Day 15
NJPW Windy City Riot 2022
NJPW 51st Anniversary Event & New Japan Cup 2023: Day 2
NJPW New Japan Cup 2023: Day 3
NJPW New Japan Cup 2023: Day 4
NJPW G1 Climax 32: Day 5
NJPW Wrestling Dontaku 2022
NJPW G1 Climax 33: Day 17
NJPW G1 Climax 33: Day 18
NJPW G1 Climax 33: Day 19 (Final)
NJPW Capital Collision 2022
NJPW Dominion 6.12 In Osaka-Jo Hall
AEW x NJPW Presents Forbidden Door 2022
ROH: Saturday Night At Center Stage
NJPW Battle in the Valley 2024
Warrior Wrestling 2
NJPW The New Beginning in Osaka 2024
NJPW x STARDOM: Historic X-Over
ROH: Honor For All
ROH Final Battle 2022
ROH Final Battle 2022 - Zero Hour
NJPW The New Beginning In Sapporo 2024 - Day 1
NJPW Wrestle Kingdom 17 Pre-Show
NJPW Sakura Genesis 2024
NJPW New Year Dash!! 2024
NJPW Wrestling Dontaku 2024 - Night 1
NJPW Wrestling Dontaku 2024 - Night 2
NJPW Resurgence 2024
NJPW The New Beginning In Sapporo 2024 - Day 2
NJPW G1 Climax 32: Day 6
NJPW G1 Climax 32: Day 7
NJPW G1 Climax 32: Day 8
NJPW G1 Climax 32: Day 9
NJPW G1 Climax 32: Day 10
NJPW G1 Climax 32: Day 11
NJPW G1 Climax 32: Day 12
NJPW G1 Climax 32: Day 13
NJPW G1 Climax 32: Day 14
NJPW Battle Autumn 2022 - Day 16
NJPW G1 Climax 32: Day 20 (Final)
NJPW G1 Climax 32: Day 15
NJPW G1 Climax 32: Day 16
NJPW G1 Climax 32: Day 17
NJPW G1 Climax 30: Day 19 (Final)
NJPW Wrestle Grand Slam In Tokyo Dome
NJPW New Year Dash !! 2023
RevPro Uprising 2016
NJPW Dominion 6.9 In Osaka-Jo Hall ~ Best of the Super Junior 31 Final ~
PWG: Prince
NJPW Power Struggle ~ Super Junior Tag League 2023
NJPW Declaration of Power
NJPW G1 Climax 34: Day 1
NJPW Wrestle Kingdom 13
AEW x NJPW Present Forbidden Door 2024
NJPW The New Beginning in Nagoya
AEW x NJPW Present Forbidden Door 2023: Zero Hour
RevPro High Stakes 2020
NJPW New Japan Soul 2024: Day 1
NJPW New Japan Soul 2024: Day 2
NJPW G1 Climax 34: Day 3
NJPW G1 Climax 34: Day 4
NJPW G1 Climax 34: Day 5
NJPW G1 Climax 34: Day 6
NJPW G1 Climax 34: Day 7
NJPW G1 Climax 34: Day 8
NJPW G1 Climax 34: Day 9
NJPW G1 Climax 34: Day 10
NJPW G1 Climax 34: Day 11
NJPW G1 Climax 34: Day 12
NJPW G1 Climax 34: Day 13
NJPW G1 Climax 34: Day 14
NJPW G1 Climax 34: Day 15
NJPW G1 Climax 34: Day 16
NJPW New Japan Soul 2024: Day 3
NJPW New Japan Soul 2024: Day 4
NJPW New Japan Soul 2024: Day 5
NJPW 52nd Anniversary Event & New Japan Cup 2024 - Day 1
NJPW New Japan Cup 2024 - Day 2
PWG: 2016 Battle of Los Angeles - Stage One
PWG: Smokey And The Bandido
NJPW G1 Climax 34: Day 17
NJPW G1 Climax 34: Day 18
NJPW Shingo Takagi's 20th Debut Anniversary Event
NJPW G1 Climax 34: Day 19 (Final)
NJPW Destruction In Ryogoku 2023
NJPW Destruction In Kobe 2023
PWG: Game Over, Man
PWG: Mystery Vortex IV
PWG: Only Kings Understand Each Other
Pancakes & Piledrivers II: The Indy Summit
PROGRESS Chapter 67: Bourbon Is Also A Biscuit
DEFY1 Legacy
DEFY2 Wolves At The Door
DEFY6 The Crash Lucha Libre
DEFY Vs. ECCW 2017
DEFY8 Kings Among Men
Bar Wrestling 3: Bar Of Hardcore
Bar Wrestling 6: Head Of Household
Bar Wrestling 9: February Stars
Bar Wrestling 11: April O'Neil
ScrapperMania 4
PWG: 2017 Battle of Los Angeles - Stage One
NJPW G1 Special In San Francisco
PWG: THIRTEEN
PWG: Head Like A Cole
PWG: Man On The Silver Mountain
PWG: All Star Weekend 14 - Night One
PWG: Mystery Vortex V
PWG: Time Is A Flat Circle
PWG: Nice Boys (Don't Play Rock and Roll)
PWG: All Star Weekend 13 - Night One
PWG: 2017 Battle of Los Angeles - Stage Two
PWG: 2017 Battle of Los Angeles - Final Stage
Wrestlecon Supershow 2018
NJPW Fighting Spirit Unleashed 2018
ROH Final Battle 2018
ROH: Honor Reigns Supreme
ROH & NJPW: Global Wars - Lewiston
Bar Wrestling
Bar Wrestling 8: Happily Ever After
NJPW New Year Dash !! 2019
ROH: Best In The World
NJPW G1 Climax 29: Day 5
NJPW G1 Climax 29: Day 6
NJPW G1 Climax 29: Day 7
NJPW G1 Climax 29: Day 4
NJPW G1 Climax 29: Day 1
NJPW G1 Climax 29: Day 3
NJPW G1 Climax 29: Day 8
NJPW G1 Climax 29: Day 9
NJPW G1 Climax 29: Day 10
NJPW G1 Climax 29: Day 2
NJPW G1 Climax 29: Day 11
NJPW G1 Climax 29: Day 12
NJPW G1 Climax 29: Day 13
NJPW G1 Climax 29: Day 14
NJPW G1 Climax 29: Day 15
NJPW G1 Climax 29: Day 19 (Final)
NJPW G1 Climax 29: Day 16
NJPW G1 Climax 29: Day 17
NJPW G1 Climax 29: Day 18
EVOLVE 78
CEOxNJPW When Worlds Collide
PWG: 2018 Battle of Los Angeles - Stage Two
PWG: 2018 Battle of Los Angeles - Stage Three
WrestleCon SuperShow 2017
ROH: Death Before Dishonor XVII
NJPW Wrestling Dontaku 2019 - Day 1
NJPW G1 Climax 30: Day 1
NJPW G1 Climax 30: Day 3
NJPW G1 Climax 30: Day 5
NJPW G1 Climax 30: Day 7
NJPW G1 Climax 30: Day 9
NJPW G1 Climax 30: Day 11
NJPW G1 Climax 30: Day 13
NJPW G1 Climax 30: Day 15
NJPW G1 Climax 30: Day 17
AAA TripleMania XXIV
NJPW Wrestle Kingdom 15: Night 2
ROH & NJPW: G1 Supercard
AAW Showdown 2018
IMPACT Wrestling vs. Lucha Underground 2018
ROH: Bound By Honor
ROH: 17th Anniversary
ROH Final Battle 2019
ROH: Unauthorized
NJPW New Year Dash !! 2021
PWG: Mystery Vortex VI
NJPW Castle Attack 2021 - Day 2
NJPW Castle Attack 2021 - Day 1
NJPW Sakura Genesis 2021
ECCW 23rd Anniversary Show
Sorry You're Watching This: Jeff Cobb & Brody King
NJPW Wrestle Grand Slam in MetLife Dome: Night 1
NJPW Road to Destruction 2024: Day 2
NJPW Road to Destruction 2024: Day 3
NJPW Road to Destruction 2024: Day 4
NJPW Road to Destruction 2024: Day 5
NJPW Destruction in Kobe 2024
NJPW King of Pro Wrestling 2024
NJPW Wrestle Kingdom 19
NJPW x STARDOM: Historic X-Over II
GCW Josh Barnett's Bloodsport 4
NJPW x AEW x CMLL x ROH x STARDOM: Wrestle Dynasty
NJPW New Year Dash!! 2025
NJPW Battle in the Valley 2025
GCW Josh Barnett’s Bloodsport 5
NJPW Sakura Genesis 2025
NJPW New Japan Cup 2025 - Day 9 (Final)
WWE Backlash 2025
WWE Night of Champions 2025
Saturday Night's Main Event XL
NJPW STRONG Fighting Spirit Unleashed 2023
WWE SummerSlam 2025: Sunday
NJPW G1 Climax 32: Day 3
NJPW 49th Anniversary Show
NJPW Wrestling Dontaku 2023
NJPW Wrestling Dontaku 2021 - Night 1
NJPW Wrestling Dontaku 2021 - Night 2
NJPW Superhuman Taiji Ishimori Gets Ridiculous
NJPW Wrestling Dontaku 2019 - Day 2
NJPW New Japan Cup 2025 - Day 1
NJPW Burning Spirit 2022 - Day 14
NJPW New Japan Cup 2025 - Day 2
NJPW New Japan Cup 2025 - Day 3
NJPW New Japan Cup 2021 - Day 13 (Final)
NJPW New Japan Cup 2021 - Day 1
NJPW New Japan Cup 2021 - Day 2
NJPW New Japan Cup 2021 - Day 3
NJPW New Japan Cup 2021 - Day 4
NJPW New Japan Cup 2021 - Day 5
NJPW New Japan Cup 2021 - Day 6
NJPW New Japan Cup 2021 - Day 7
NJPW New Japan Cup 2021 - Day 9
NJPW New Japan Cup 2021 - Day 10
NJPW New Japan Cup 2021 - Day 11
NJPW New Japan Cup 2021 - Day 12
AAW Defining Moment 2016
AAW Jim Lynam Memorial Tournament - Tag 2
NJPW Royal Quest III
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