During the height of K-1, Mighty Mo fought the elite kickboxers in the planet and established himself among the best in combat sports. After he debuted in Japan, the American-Samoan heavyweight went on to win multiple K-1 Grand Prix tournaments, and also did well during the few times he crossed over to mixed martial arts.
After gaining success and fan fare early in his career, Mo eventually hit a rough patch both in his personal and professional life. He had understandable losses to legends and champion fighters such as Semmy Schilt, Josh Barnett and Kyotaro, but then he continued to struggle for years in the kickboxing circuit.