Jeffrey Cobb is an American professional wrestler and former amateur wrestler. As of May 2025, he is signed to WWE, where he performs on the SmackDown brand under the ring name JC Mateo. He is best known for his tenure in New Japan Pro-Wrestling (NJPW), where he was a member of United Empire.
In NJPW, he is a former one-time NEVER Openweight Champion and a three-time IWGP Tag Team Champion. He also wrestled for various promotions, such as Lucha Underground (as the masked wrestler Matanza Cueto) where he is a former one-time Lucha Underground Champion, Ring of Honor (ROH), where he is a former one-time ROH Television Champion, as well as Pro Wrestling Guerrilla (PWG) where he is a former one-time PWG World Champion, one-time World Tag Team Champion, and is also the winner of the 2018 Battle of Los Angeles.
As an amateur wrestler, Cobb represented Guam at the 2004 Summer Olympics, where he became the nation's flag bearer in the opening ceremony and competed in the men's light heavyweight freestyle category. He transitioned to professional wrestling in 2009.
Known For

Saturday Night's Main Event XL
JC Mateo
2025

WWE Night of Champions 2025
JC Mateo
2025

WWE Backlash 2025
Jeff Cobb
2025

NJPW Sakura Genesis 2025
Jeff Cobb
2025

NJPW New Japan Cup 2025 - Final
Jeff Cobb
2025

NJPW Battle in the Valley
Jeff Cobb
2025

NJPW New Year Dash!! 2025
Jeff Cobb
2025

NJPW x AEW x CMLL x ROH x STARDOM: Wrestle Dynasty
Jeff Cobb
2025

NJPW Wrestle Kingdom 19
Jeff Cobb
2025

NJPW x STARDOM: Historic X-Over II
Jeff Cobb
2024

NJPW Power Struggle ~ Super Junior Tag League 2024
Jeff Cobb
2024

NJPW: King Of Pro Wrestling 2024
Jeff Cobb
2024

NJPW Destruction In Kobe 2024
Jeff Cobb
2024
NJPW Road to Destruction 2024: Day 5
Jeff Cobb
2024
NJPW Road to Destruction 2024: Day 4
Jeff Cobb
2024
NJPW Road to Destruction 2024: Day 3
Jeff Cobb
2024
NJPW Road to Destruction 2024: Day 2
Jeff Cobb
2024

NJPW Shingo Takagi's 20th Debut Anniversary Event
Jeff Cobb
2024

NJPW G1 Climax 34: Day 19 (Final)
Jeff Cobb
2024

NJPW G1 Climax 34: Day 18
Jeff Cobb
2024

NJPW G1 Climax 34: Day 17
Jeff Cobb
2024

NJPW G1 Climax 34: Day 16
Jeff Cobb
2024

NJPW G1 Climax 34: Day 15
Jeff Cobb
2024

NJPW G1 Climax 34: Day 14
Jeff Cobb
2024

NJPW G1 Climax 34: Day 13
Jeff Cobb
2024

NJPW G1 Climax 34: Day 12
Jeff Cobb
2024

NJPW G1 Climax 34: Day 11
Jeff Cobb
2024

NJPW G1 Climax 34: Day 10
Jeff Cobb
2024

NJPW G1 Climax 34: Day 9
Jeff Cobb
2024

NJPW G1 Climax 34: Day 8
Jeff Cobb
2024

NJPW G1 Climax 34: Day 7
Jeff Cobb
2024

NJPW G1 Climax 34: Day 6
Jeff Cobb
2024

NJPW G1 Climax 34: Day 5
Jeff Cobb
2024

NJPW G1 Climax 34: Day 4
Jeff Cobb
2024

NJPW G1 Climax 34: Day 3
Jeff Cobb
2024

NJPW G1 Climax 34: Day 1
Jeff Cobb
2024

AEW x NJPW Present Forbidden Door
Jeff Cobb
2024

NJPW New Japan Soul 2024: Day 5
Jeff Cobb
2024

NJPW New Japan Soul 2024: Day 4
Jeff Cobb
2024

NJPW New Japan Soul 2024: Day 3
Jeff Cobb
2024

NJPW New Japan Soul 2024: Day 2
Jeff Cobb
2024

NJPW New Japan Soul 2024: Day 1
Jeff Cobb
2024

NJPW Dominion 6.9 In Osaka-Jo Hall ~ Best Of The Super Junior 31 Final ~
Jeff Cobb
2024

NJPW Resurgence 2024
Jeff Cobb
2024

NJPW Wrestling Dontaku 2024 - Night 2
Jeff Cobb
2024

NJPW Wrestling Dontaku 2024 - Night 1
Jeff Cobb
2024

NJPW Sakura Genesis 2024
Jeff Cobb
2024

NJPW New Japan Cup 2024 • Day 2
Jeff Cobb
2024

NJPW 52nd Anniversary Event & New Japan Cup 2024: Day 1
Jeff Cobb
2024

NJPW The New Beginning In Sapporo 2024 - Night 2
Jeff Cobb
2024

NJPW The New Beginning In Sapporo 2024 - Night 1
Jeff Cobb
2024

NJPW The New Beginning in Osaka 2024
Jeff Cobb
2024

NJPW The New Beginning in Nagoya
Jeff Cobb
2024

NJPW Battle in the Valley
Jeff Cobb
2024

NJPW New Year Dash!! 2024
Jeff Cobb
2024

NJPW Power Struggle ~ Super Junior Tag League 2023
Jeff Cobb
2023

NJPW Destruction In Ryogoku 2023
Jeff Cobb
2023

NJPW Destruction In Kobe 2023
Jeff Cobb
2023

NJPW G1 Climax 33: Day 19 (Final)
Jeff Cobb
2023

NJPW G1 Climax 33: Day 18
Jeff Cobb
2023

NJPW G1 Climax 33: Day 17
Jeff Cobb
2023

NJPW G1 Climax 33: Day 16
Jeff Cobb
2023

NJPW G1 Climax 33: Day 15
Jeff Cobb
2023

NJPW G1 Climax 33: Day 14
Jeff Cobb
2023

NJPW G1 Climax 33: Day 13
Jeff Cobb
2023

NJPW G1 Climax 33: Day 12
Jeff Cobb
2023

NJPW G1 Climax 33: Day 10
Jeff Cobb
2023

NJPW G1 Climax 33: Day 8
Jeff Cobb
2023

NJPW G1 Climax 33: Day 6
Jeff Cobb
2023

NJPW G1 Climax 33: Day 4
Jeff Cobb
2023

NJPW G1 Climax 33: Day 2
Jeff Cobb
2023

AEW x NJPW Present Forbidden Door: Zero Hour
Jeff Cobb
2023

NJPW Dominion 6.4 in Osaka-jo Hall
Jeff Cobb
2023

NJPW Sakura Genesis 2023
Jeff Cobb
2023

ROH: Supercard of Honor 2023: Zero Hour
Jeff Cobb
2023

GCW Josh Barnett's Bloodsport 9
Jeff Cobb
2023

IMPACT Wrestling x NJPW: Multiverse United: Only The Strong Survive
Jeff Cobb
2023

Mark Hitchcock Memorial Wrestlecon Supershow 2023
Jeff Cobb
2023
NJPW New Japan Cup 2023: Day 4
Jeff Cobb
2023
NJPW New Japan Cup 2023: Day 3
Jeff Cobb
2023
NJPW 51st Anniversary Event & New Japan Cup 2023: Day 2
Jeff Cobb
2023

NJPW New Year Dash !! 2023
Jeff Cobb
2023

NJPW Wrestle Kingdom 17 Pre-Show
Jeff Cobb
2023

ROH: Final Battle
Jeff Cobb
2022

ROH: Final Battle - Zero Hour
Jeff Cobb
2022

NJPW x STARDOM: Historic X-Over
Jeff Cobb
2022
NJPW Battle Autumn 2022 - Night 16
Jeff Cobb
2022

NJPW Declaration Of Power
Jeff Cobb
2022

NJPW G1 Climax 32: Day 20 (Final)
Jeff Cobb
2022

NJPW G1 Climax 32: Day 17
Jeff Cobb
2022

NJPW G1 Climax 32: Day 16
Jeff Cobb
2022

NJPW G1 Climax 32: Day 15
Jeff Cobb
2022

NJPW G1 Climax 32: Day 14
Jeff Cobb
2022

NJPW G1 Climax 32: Day 13
Jeff Cobb
2022

NJPW G1 Climax 32: Day 12
Jeff Cobb
2022

NJPW G1 Climax 32: Day 11
Jeff Cobb
2022

NJPW G1 Climax 32: Day 10
Jeff Cobb
2022

NJPW G1 Climax 32: Day 9
Jeff Cobb
2022

NJPW G1 Climax 32: Day 8
Jeff Cobb
2022

NJPW G1 Climax 32: Day 7
Jeff Cobb
2022

NJPW G1 Climax 32: Day 6
Jeff Cobb
2022

NJPW G1 Climax 32: Day 5
Jeff Cobb
2022

NJPW G1 Climax 32: Day 4
Jeff Cobb
2022

NJPW G1 Climax 32: Day 3
Jeff Cobb
2022

NJPW G1 Climax 32: Day 2
Jeff Cobb
2022

NJPW G1 Climax 32: Day 1
Jeff Cobb
2022

AEW x NJPW Presents Forbidden Door
Jeff Cobb
2022

NJPW Dominion 6.12 In Osaka-Jo Hall
Jeff Cobb
2022

NJPW Capital Collision 2022
Jeff Cobb
2022

NJPW Wrestling Dontaku
Jeff Cobb
2022

NJPW Windy City Riot
Jeff Cobb
2022

NJPW Wrestle Kingdom 16: Night 2
Jeff Cobb
2022

NJPW Wrestle Kingdom 16: Night 1
Jeff Cobb
2022

NJPW: Battle In The Valley
Jeff Cobb
2021

NJPW G1 Climax 31: Day 19 (Final)
Jeff Cobb
2021

NJPW G1 Climax 31: Day 18
Jeff Cobb
2021

NJPW G1 Climax 31: Day 16
Jeff Cobb
2021

NJPW G1 Climax 31: Day 14
Jeff Cobb
2021

NJPW G1 Climax 31: Day 12
Jeff Cobb
2021

NJPW G1 Climax 31: Day 10
Jeff Cobb
2021

NJPW G1 Climax 31: Day 8
Jeff Cobb
2021

NJPW G1 Climax 31: Day 6
Jeff Cobb
2021

NJPW G1 Climax 31: Day 4
Jeff Cobb
2021

NJPW G1 Climax 31: Day 2
Jeff Cobb
2021

NJPW Wrestle Grand Slam in MetLife Dome: Night 2
Jeff Cobb
2021

NJPW Wrestle Grand Slam in MetLife Dome: Night 1
Jeff Cobb
2021

NJPW Wrestle Grand Slam In Tokyo Dome
Jeff Cobb
2021

NJPW Dominion 6.6 in Osaka-jo Hall
Jeff Cobb
2021

NJPW Sakura Genesis 2021
Jeff Cobb
2021

NJPW Castle Attack 2021 - Night 2
Jeff Cobb
2021

NJPW Castle Attack 2021 - Night 1
Jeff Cobb
2021

GCW Josh Barnett’s Bloodsport 5
Jeff Cobb
2021

GCW Josh Barnett's Bloodsport 4
Jeff Cobb
2021

NJPW New Year Dash !! 2021
Jeff Cobb
2021

NJPW Wrestle Kingdom 15: Night 2
Jeff Cobb
2021

NJPW G1 Climax 30: Day 19 (Final)
Jeff Cobb
2020

NJPW G1 Climax 30: Day 17
Jeff Cobb
2020

NJPW G1 Climax 30: Day 15
Jeff Cobb
2020

NJPW G1 Climax 30: Day 13
Jeff Cobb
2020

NJPW G1 Climax 30: Day 11
Jeff Cobb
2020

NJPW G1 Climax 30: Day 9
Jeff Cobb
2020

NJPW G1 Climax 30: Day 7
Jeff Cobb
2020

NJPW G1 Climax 30: Day 5
Jeff Cobb
2020

NJPW G1 Climax 30: Day 3
Jeff Cobb
2020

NJPW G1 Climax 30: Day 1
Jeff Cobb
2020

NJPW STRONG
Jeff Cobb · (6 episodes)
2020

Sorry You're Watching This: Jeff Cobb & Brody King
Jeff Cobb
2020

ROH: Bound By Honor
Jeff Cobb
2020

RevPro: High Stakes 2020
Jeff Cobb
2020

ROH: Final Battle 2019
Jeff Cobb
2019

ROH: Unauthorized
El Jefe Cobo
2019

All Elite Wrestling: Dynamite
Jeff Cobb · (4 episodes)
2019

ROH: Death Before Dishonor XVII
Jeff Cobb
2019

ROH: Saturday Night At Center Stage
Jeff Cobb
2019

ROH: Honor For All
Jeff Cobb
2019

NJPW G1 Climax 29: Day 19 (Final)
Jeff Cobb
2019

NJPW G1 Climax 29: Day 18
Jeff Cobb
2019

NJPW G1 Climax 29: Day 17
Jeff Cobb
2019

NJPW G1 Climax 29: Day 16
Jeff Cobb
2019

NJPW G1 Climax 29: Day 15
Jeff Cobb
2019

NJPW G1 Climax 29: Day 14
Jeff Cobb
2019

NJPW G1 Climax 29: Day 13
Jeff Cobb
2019

NJPW G1 Climax 29: Day 12
Jeff Cobb
2019

NJPW G1 Climax 29: Day 11
Jeff Cobb
2019

NJPW G1 Climax 29: Day 10
Jeff Cobb
2019

NJPW G1 Climax 29: Day 9
Jeff Cobb
2019

NJPW G1 Climax 29: Day 8
Jeff Cobb
2019

NJPW G1 Climax 29: Day 7
Jeff Cobb
2019

NJPW G1 Climax 29: Day 6
Jeff Cobb
2019

NJPW G1 Climax 29: Day 5
Jeff Cobb
2019

NJPW G1 Climax 29: Day 4
Jeff Cobb
2019

NJPW G1 Climax 29: Day 3
Jeff Cobb
2019

NJPW G1 Climax 29: Day 2
Jeff Cobb
2019

NJPW G1 Climax 29: Day 1
Jeff Cobb
2019

ROH: Best In The World
Jeff Cobb
2019
ECCW 23rd Anniversary Show
Jeff Cobb
2019

PWG: Mystery Vortex VI
2019

NJPW Wrestling Dontaku 2019 - Night 1
2019

ROH & NJPW: G1 Supercard
Jeff Cobb
2019

ROH: 17th Anniversary
Jeff Cobb
2019
ROH: Honor Reigns Supreme
Jeff Cobb
2019
NJPW New Year Dash !! 2019
Jeff Cobb
2019

NJPW Wrestle Kingdom 13
Jeff Cobb
2019
ROH: Final Battle 2018
Jeff Cobb
2018

ROH & NJPW: Global Wars - Lewiston
Jeff Cobb
2018

PWG: Smokey And The Bandido
Jeff Cobb
2018

NJPW Fighting Spirit Unleashed
Jeff Cobb
2018

PWG: 2018 Battle of Los Angeles - Stage Three
2018

PWG: 2018 Battle of Los Angeles - Stage Two
2018
Warrior Wrestling 2
Jeff Cobb
2018

NJPW G1 Special In San Francisco
Jeff Cobb
2018

CEOxNJPW When Worlds Collide
2018

ScrapperMania 4
2018

PWG: All Star Weekend 14 - Night One
Jeff Cobb
2018
Bar Wrestling 11: April O'Neil
2018

Pancakes & Piledrivers II: The Indy Summit
2018

PROGRESS Chapter 67: Bourbon Is Also A Biscuit
Himself
2018

IMPACT Wrestling vs. Lucha Underground 2018
Jeff Cobb
2018

Wrestlecon Supershow 2018
2018

PWG: Time Is A Flat Circle
Jeff Cobb
2018

Bar Wrestling 9: February Stars
Jeff Cobb
2018
AAW Showdown 2018
2018

Bar Wrestling 8: Happily Ever After
Jeff Cobb
2018

PWG: Mystery Vortex V
Jeff Cobb
2018

PWG: All Star Weekend 13 - Night One
Jeff Cobb
2017

DEFY8 Kings Among Men
Jeff Cobb
2017

Bar Wrestling 6: Head Of Household
2017

DEFY Vs. ECCW 2017
Jeff Cobb
2017

PWG: 2017 Battle of Los Angeles - Final Stage
Jeff Cobb
2017

PWG: 2017 Battle of Los Angeles - Stage Two
Jeff Cobb
2017

PWG: 2017 Battle of Los Angeles - Stage One
Jeff Cobb
2017

Bar Wrestling 3: Bar Of Hardcore
Jeff Cobb
2017

DEFY6 The Crash Lucha Libre
2017

PWG: Man On The Silver Mountain
Jeff Cobb
2017

Bar Wrestling
Jeff Cobb
2017

PWG: Head Like A Cole
Jeff Cobb
2017

PWG: Game Over, Man
Jeff Cobb
2017

DEFY2 Wolves At The Door
Jeff Cobb
2017

WrestleCon SuperShow 2017
2017

PWG: Nice Boys (Don't Play Rock and Roll)
Jeff Cobb
2017
EVOLVE 78
2017

PWG: Only Kings Understand Each Other
Jeff Cobb
2017

DEFY1 Legacy
Jeff Cobb
2017
AAW Unstoppable 2016
Jeff Cobb
2016

PWG: Mystery Vortex IV
Jeff Cobb
2016

PWG: 2016 Battle of Los Angeles - Stage One
Jeff Cobb
2016

AAA TripleMania XXIV
The Monster Matanza Cueto
2016

RevPro: Uprising 2016
Jeff Cobb
2016

PWG: THIRTEEN
Jeff Cobb
2016

PWG: Prince
Himself
2016

Lucha Underground
Jeff Cobb · (39 episodes)
2014

Lucha Underground
Matanza · (26 episodes)
2014

Lucha Underground
Matanza Cueto · (4 episodes)
2014

WWE SmackDown
JC Mateo · (8 episodes)
1999

New Japan Pro Wrestling
(11 episodes)
1972