#4 Norifumi Yamamoto
Norifumi Yamamoto might not have an impressive record to showcase in the UFC as he did not win any fight in the promotion, but he was one of the best MMA fighters that came out of Japan. He started his career in 2001 and fought in multiple promotions to build up a professional record of 18-3 before entering the UFC. From this 18, 13 wins came via finishes as well.
During this run, he defeated some notable names like Bibiano Fernandes and Royler Gracie. In the UFC, however, Yamamoto struggled. His first fight came against Demetrious Johnson and it ended in favour of Johnson via a decision.
Yamamoto then fought three more times in the promotion. He lost twice and in his last fight in the UFC and in his career, Yamamoto had to settle for a no-contest after an accidental eye poke.
In 2018, Yamamoto revealed that he was diagnosed with cancer. On September 18, 2018, he passed away due to the illness.