In 2000, he won the gold medal of Japanese national championship for undergraduates in full contact taekwondo at open weight.
He defeated Masanobu Goto by a clear unanimous decision at Krush-EX 2012 vol.5 on October 21, 2012, at Shinjuki Face in Tokyo.
[1][2] He lost to Jessy Petit-Jean in a fight for the WKN World Lightweight Kickboxing Championship on November 17, 2012, in Liège, Belgium.
[3] He lost a majority decision to Hiroya in a non-tournament bout at Krush Grand Prix 2013 ~67kg Tournament First Round~ on January 14, 2013, in Tokyo.
[4][5] Ozaki faced fellow taekwondo stylist Seiji Takahashi at NJKF: 2013 3rd in Tokyo on April 29, 2013.