Joseph Jonathan Riggs (born September 23, 1982) is an American mixed martial arts fighter. Currently, Riggs fights as a Welterweight, after starting his career off as a Heavyweight, and has moved down one weight class at a time as his career has progressed. He earned the nickname "Diesel" primarily for his no-nonsense approach, and bruising style in the cage, punctuated by hard punches, and heavy kicks. Riggs is the former WEC Middleweight Champion, and has also fought for the UFC, Strikeforce, and Bellator.