New Zealand's Israel Adesanya has come up short in his quest to become a mixed martial arts world champion in two different divisions.The UFC middleweight champion stepped up a weight class and unsuccessfully challenged Poland's Jan Blachowicz for the light heavyweight world title in Las Vegas last night.The unanimous decision defeat was also the first loss of Adesanya's professional MMA career, after he had come into the contest with a perfect 20 wins from 20 fights.Clay Wilson reports.