Career
He comes from a Seidokaikan karate background and is known for his unorthodox kicks. Yamamoto began practicing karate at the age of 13. He made his professional kickboxing debut on August 16, 2008 when he defeated Marcelo Nascimento by a unanimous decision.
In his following fight he made his debut in the K-1 promotion at "the K-1 World MAX 2009 World Championship Tournament Final 8 and was knocked out by Jae Gil Noh.
Following this he went on an eight fight unbeaten run consisting of seven wins and one draw. He returned to K-1 in a tournament reserve match at K-1 World MAX 2011 -70kg Japan Tournament Final on September 25, 2011.
He defeated Yoshi via a unanimous decision.