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. Cobb transitioned to professional wrestling in 2009.
Amateur wrestling career
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 nineteenth overall out of twenty-two wrestlers.
Professional wrestling career
Early career (2009–2014)
Cobb began professional wrestling in 2009 working for Action Zone Wrestling in Hawaii where he became a two-time AZW Heavyweight Champion. He made appearances for many independent promotions in northern California such as All Pro Wrestling, Supreme Pro Wrestling, Pro Wrestling Bushido and PREMIER Wrestling; where he held their heavyweight championship for 427 days.
Lucha Underground (2015–present)
Cobb signed to Lucha Underground in 2015. He debuted for the promotion on March 22, 2016 under a mask and the ring name Matanza, the storyline brother of Dario Cueto, winning the Lucha Underground Championship in his first match.
- Finishing moves
- Tour of the Island / Wrath of the Gods (Reverse-spin scoop powerslam)
- Signature moves
- Multiple suplex variations
- Pop-up sitout powerbomb
- Running European uppercut
- Slamfest (Standing moonsault fallaway slam followed by a forward fireman's carry slam)
- Standing shooting star press
- "The Eater of Worlds"
- "Mr. Athletic"
- "The Monster"
- Hawaiian Hulk
Championships and accomplishments
- Pro Wrestling Guerrilla
- Pro Wrestling Illustrated
|Ring of Honor|
|Adam Page • Alex Shelley • Beretta • Beer City Bruiser • BJ Whitmer • Brian Milonas • Brody King • Bully Ray • Caprice Coleman • Cheeseburger • Chris Sabin • Christopher Daniels • Chuckie T • Cody • Colt Cabana • Dalton Castle • Delirious • Eli Isom • Flip Gordon • Frankie Kazarian • Gabby Ortiz • Jay Briscoe • Jay Lethal • Jeff Cobb • Jenny Rose • Jessie Brooks • Jonathan Gresham • Josh Woods • Kelly Klein • Kenny King • LSG • Madison Rayne • Mandy Leon • Mark Briscoe • Marty Scurll • Matt Jackson • Matt Taven • Nick Jackson • PCO • Rhett Titus • Rocky Romero • Ryan Nova • Scorpio Sky • Shaheem Ali • Shane Taylor • Silas Young • Stella Grey • Sumie Sakai • The Boys • TK O'Ryan • Vinny Marseglia • Will Ferrara|