Larsen was scheduled to face Leo Bonniger at The Champions Club 10 in Hamburg, Germany for the WKU World Muay Thai middleweight title on April 27, 2013.
[2] Larsen was called to replace Sanny Dahlbeck in a fight against Andy Ristie at Glory 10: Los Angeles - Middleweight World Championship Tournament in Ontario, California on September 28, 2013.
[6][7] In 2016 Larsen contracted a staph infection to the leg which had him close to amputation and made him unable to compete for a year.
[8] Larsen made his return to competition on February 24, 2017, at Glory 38: Chicago with a unanimous decision victory over Lukasz Plawecki.
[10] Larsen was called to replace Liam Nolan on short notice to face Youssef Boughanem for the WBC Muay Thai World middleweight title at PSM Fight Night on July 17, 2022.
[13] On December 11, 2021, Larsen faced Valentin Thibaut for the vacant WBC Muay Thai World Super Welterweight title.