Ronald Andrew Jhun Jr.[1] (born September 21, 1970) is an American professional mixed martial artist who most recently competed in the Welterweight division.
A professional competitor since 1998, Jhun has formerly competed for the UFC, Strikeforce, Shooto, King of the Cage, Rumble on the Rock, and the World Fighting Alliance.
After graduating, Jhun was introduced to mixed martial arts by his brother-in-law, Ray Cooper, and David Pa'aluhi, who would both also go on to have success as professional MMA fighters.
Jhun returned to the regional circuit, and went on a ten-fight losing streak during which he competed at Strikeforce: Triple Threat against Eugene Jackson in a Middleweight bout on December 8, 2006.
Jhun has gone 2–6 in his last eight fights, but on August 7, 2010, defeated Michael Winkelspecht via rear-naked choke submission in the second round to become the X-1 Middleweight Champion.