Fujimoto made his professional kickboxing debut at K-1 Rising 2000 on January 25, 2000 and scored a second round TKO victory over Masanobu Yamanaka.

This was the only championship Fujimoto would win for some time: he entered four regional tournaments within the following three years but was regularly defeated, advancing no further than the last match of the K-1 Survival 2003 Japan Grand Prix Final.

In March 2007, he entered a tournament to determine the first K-1 Heavyweight Champion and met Musashi in the semifinals at the K-1 World Grand Prix 2007 in Yokohama.

In one of the most significant wins of his career, Fujimoto exercised great timing and reach over the two-time WGP runner-up, eventually securing a TKO with a kick to the head.

[1] Fujimoto entered his finals match to conspicuous silence from the crowd, but eventually elicited cheers upon defeating sanshou champion Wang Qiang.

[1] Fujimoto subsequently reached the WGP final elimination for a second time but forfeited to opponent Junichi Sawayashiki following multiple knockdowns.

[5] These considerations proved concrete, as Fujimoto engaged in his retirement match on November 3, 2009 – defeating Junpei Hamada by unanimous decision at the Japan-Korea International Martial Arts Competition.