Watanabe, aged 21, started his career on January 2008. Although still relatively close to the start of his career, his record stands at 6-2-1 and Watanabe will want to add some more wins to that throughout the next stage inhis career. The longest win streak that Watanabe has ever recorded was between January 2008 and September 2008 when it totaled 3 wins. Watanabe's longest KO streak is 1 fights long.
A successful pro debut for Kenichi, Watanabe showed his superior boxing talent against Wataru Yamada, becoming the first person to go the full distance with him. Watanabe continued his pro journey by fighting 5 fights following their debut. Fights against boxers such as Eiji Nagataki, Kenichi Tokano and Ryota Kamimura followed including 3 times in 2008 and once in 2010.
On April 13th, 2009, Watanabe took on and was defeated by Koki Eto in his first career defeat meaning his career tally went to 3-1-0. Watanabe's technical boxing ability was put to the test as he got outpointed in the 4 round fight against the better man. Eto gave Watanabe his first professional loss of his 4 fight career to date. 3 wins followed where Watanabe went on to fight Yuki Furuya and Kenichi Tokano amongst others, prolonging his win streak.
Watanabe went into his next career fight with a record of 5-1-1 and took this to 6 wins with a win against Tomoya Murata on July 4th, 2012. Murata was a worthy challenger but Watanabe was too much and became the first person to stop Murata via TKO during round 3.
Taking another knock in his career, Watanabe fought Akinori Hoshino on December 12th, 2012 and was defeated by Hoshino. This bout proved to be the toughest of Watanabe's 9 career fights to date. Hoshino was too skilful and took 5 rounds to dispose of Watanabe. This was Watanabe's first stoppage defeat as he looks to move on and rebuild going forwards.