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Jeff Cobb
Jeffrey Cobb (ジェフリー・コブ, Jefurī Kobu; born July 11, 1982) 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 a member of The MFT stable. He is best known for his tenure in New Japan Pro-Wrestling (NJPW), where he performed under his real name and was a member of United Empire.
In NJPW, he is a former one-time NEVER Openweight Champion, one-time NJPW World Television 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 PWG 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.
During his amateur wrestling career, Cobb trained for the Guam Amateur Wrestling Federation under his personal coach Neil Krantz. Cobb qualified for the Guamanian squad in the men's 84 kg class at the 2004 Summer Olympics in Athens by receiving a continental berth from the Oceanian Championships in Dededo. He received two straight losses due to technical superiority and no classification points in a preliminary pool match against Cuba's Yoel Romero and Germany's Davyd Bichinashvili, finishing 21st overall out of 22 wrestlers.
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.
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.
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Jeff Cobb
Jeffrey Cobb (ジェフリー・コブ, Jefurī Kobu; born July 11, 1982) 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 a member of The MFT stable. He is best known for his tenure in New Japan Pro-Wrestling (NJPW), where he performed under his real name and was a member of United Empire.
In NJPW, he is a former one-time NEVER Openweight Champion, one-time NJPW World Television 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 PWG 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.
During his amateur wrestling career, Cobb trained for the Guam Amateur Wrestling Federation under his personal coach Neil Krantz. Cobb qualified for the Guamanian squad in the men's 84 kg class at the 2004 Summer Olympics in Athens by receiving a continental berth from the Oceanian Championships in Dededo. He received two straight losses due to technical superiority and no classification points in a preliminary pool match against Cuba's Yoel Romero and Germany's Davyd Bichinashvili, finishing 21st overall out of 22 wrestlers.
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.
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.