Kenji Kubo (born 4 April 1989), also known simply as KENJI, is a Japanese kickboxer and former professional boxer. He is the finalist, the 2011 RISE Bantamweight champion and the 2007 NJKF Flyweight champion.
Kubo returned to K-1 in 2017, and was immediately scheduled to take part in the . It was his first kickboxing bout in nearly five years. Kubo beat Suen Tak Chuen by an extra round unanimous decision in the quarterfinals, and Nobuchika Terado by a second-round knockout in the semifinals. Kubo fought Yoshiki Takei in the finals, and lost the fight by unanimous decision.
After he finished as the runner-up in the Super Bantamweight Grand Prix, Kubo was scheduled to fight a rematch with Nobuchika Terado for the Krush Super Bantamweight title, at Krush 82. The fight was declared a draw after three rounds, and went into an extra round, after which Terado won a unanimous decision.
Kubo was scheduled to fight a rematch with Yoshiki Takei for the K-1 Super Bantamweight title at . Takei won the fight by knockout midway through the first round.
|-style="background:#fbb;" | 2018-03-21 || Loss|| align=left| Yoshiki Takei || || Saitama, Japan || KO (Right Hook) || 1 || 1:27 |- ! style=background:white colspan=9 | |- style="background:#fbb;" | 2017-11-05|| Loss||align=left| Nobuchika Terado || Krush.82 || Tokyo, Japan || Ext.R Decision (Unanimous) || 4 || 3:00 |- ! style=background:white colspan=9 | |- bgcolor="#fbb" | 2017-04-22 || Loss|| align=left| Yoshiki Takei || , Final || Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2017-04-22|| Win||align=left| Nobuchika Terado || , Semi Finals || Tokyo, Japan || KO (Left Straight) || 2 || 3:00 |- style="background:#cfc;" | 2017-04-22|| Win||align=left| Suen Tak Chuen || , Quarter Finals || Tokyo, Japan || Ext.R Decision (Unanimous)|| 4 || 3:00 |- bgcolor="#cfc" | 2012-06-06 || Win||align=left| Franck Gross || RISE 88|| Tokyo, Japan|| KO (Left Hook to the Body) ||3|| 0:29 |- bgcolor="#cfc" | 2012-06-06 || Win ||align=left| Mikihito Yamagami || RISE 87|| Tokyo, Japan|| Decision (Unanimous) ||3|| 3:00 |- bgcolor="#cfc" | 2012-01-29 || Win ||align=left| Pajonsuk Por.Pramuk || RISE 86|| Tokyo, Japan|| Decision (Unanimous) ||3|| 3:00 |- bgcolor="#cfc" | 2011-11-23 || Win ||align=left| Dyki || RISE 85|| Tokyo, Japan|| KO (Left hook to the body) ||1|| 1:35 |- ! style=background:white colspan=9 | |- bgcolor="#cfc" | 2011-09-23 || Win ||align=left| Ryuma Tobe || RISE 83|| Tokyo, Japan|| Decision (Majority) ||3|| 3:00 |- bgcolor="#cfc" | 2011-08-21 || Win ||align=left| Keiichita Matsumoto || Bigbang 6|| Tokyo, Japan|| KO (Left High Kick) ||2|| 2:49 |- bgcolor="#cfc" | 2011-05-27 || Win ||align=left| Shin Jyu Oh || Survivorï½ÂRound.7ï½Â|| Tokyo, Japan|| TKO (Punches) ||1|| 2:26 |- style="background:#fbb;" | 2011-04-30|| Loss||align=left| Shota Takiya || Krush Inaugural Championship Tournament ï½ÂTriple Final Roundï½ÂSemi Final || Tokyo, Japan ||Ext.R Decision (Unanimous) || 4 || 3:00 |- style="background:#cfc;" | 2010-12-12|| Win||align=left| Kazuki Tanaka || Krush Inaugural Championship Tournament Quarter Final || Tokyo, Japan || KO (Left Hook) || 2 || 0:55 |- style="background:#cfc;" | 2010-10-08|| Win||align=left| Hiroaki Mizuhara || Survivor ãÂÂRound.5ã || Tokyo, Japan ||Decision (Majority) || 3 ||3:00 |- style="background:#cfc;" | 2010-07-18|| Win||align=left| Kentaro Kimura || Survivor ãÂÂRound.4ã || Tokyo, Japan ||Decision (Unanimous) || 3 ||3:00 |- style="background:#cfc;" | 2010-05-27|| Win||align=left| Akitaka Sugiyama || Krush 7 || Tokyo, Japan || KO (Left Hook) || 1 || 2:34 |- style="background:#fbb;" | 2010-03-13|| Loss||align=left| Nobuchika Terado || Krush àSurvivor|| Tokyo, Japan || KO (Punches) || 2 || 2:26 |- style="background:#cfc;" | 2010-01-25|| Win ||align=left| Shin Yoshida || Survivorï½ÂRound.3ï½Â|| Tokyo, Japan || KO (Right Cross) || 1 || 1:40 |- style="background:#fbb;" | 2009-12-09|| Loss||align=left| Shota Takiya|| Survivorï½ÂRound.2ï½ || Tokyo, Japan ||Decision (Majority) || 3 ||3:00 |- style="background:#cfc;" | 2009-09-28|| Win ||align=left| Taisuke Degai || Survivorï½ÂRound.1ï½Â|| Tokyo, Japan || Decision (Split) || 3 || 3:00 |- style="background:#fbb;" | 2008-05-14|| Loss||align=left| Wanphet Phetputhon || Rajadamnern Stadium || Bangkok, Thailand ||Decision || 5 ||3:00 |- style="background:#cfc;" | 2007-11-21|| Win ||align=left| || || Phnom Penh, Cambodia || Decision || || |- style="background:#cfc;" | 2007-09-02|| Win ||align=left| Lee Hi Do || NJKF FIGHTING EVOLUTION X || Tokyo, Japan || TKO (Towel thrown/Low Kick) || 1 || 2:38 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2007-07-13|| Win ||align=left| Nakbin Patong gym|| Bangla Stadium || Patong, Thailand || KO (Elbow) || 2 || |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2007-05-13|| Win ||align=left| Yusuke Nakanishi || NJKF FIGHTING EVOLUTION VI || Tokyo, Japan || TKO (Doctor Stoppage) || 3 || 2:49 |- style="background:#cfc;" | 2007-03-18|| Win ||align=left| Daisuke || NJKF FIGHTING EVOLUTION III || Tokyo, Japan || KO (Low Kick) || 2 || 3:00 |- style="background:#cfc;" | 2007-01-28|| Win ||align=left| Samingnum SKV gym|| NJKF FIGHTING EVOLUTION II || Tokyo, Japan || KO || 2 || 2:11 |- style="background:#cfc;" | 2006-11-23|| Win ||align=left| Naoki Ootsuki|| NJKF || Tokyo, Japan || TKO (Doctor Stoppage) || 3 || 2:58 |- style="background:#cfc;" | 2006-09-17|| Win ||align=left| Rose Tasuya|| TRIAL LEAGUE.7 || Tokyo, Japan || TKO (3 Knockdowns) || 2 || 2:43 |- | colspan=9 | Legend:
|-style="background:#fbb;" | 2007-12-31 || Loss|| align=left| Yudai || K-1 PREMIUM 2007 Dynamite!! K-1 Koshien Tournament Semi Final || Osaka, Japan || Decision (Unanimous) || 3 || 3:00 |- | colspan=9 | Legend: