The following is an excerpt from an article on MMAWeekly.com:
Following a rocky time in the Ultimate Fighting Championship, capped by a surprising knockout loss to Octagon newcomer Junior dos Santos at UFC 90, Chute Boxe fighter Fabricio Werdum has left the promotion.
Sources tell MMAWeekly.com that Werdum's exit comes on the heels of a failed contract renegotiation following the loss to dos Santos. The Brazilian came into the fight with the expectation that he would soon be contending for a heavyweight title shot.
The knockout at UFC 90 derailed anything of the like in the near future, and spurred a renegotiation of his contract. Werdum and the UFC were apparently unable to come to an agreement. He has already opened talks with other promotions in the U.S. and Japan.