7. Igor Vovchanchyn
Easily one of the most exciting fighters ever to compete in MMA, Vovchanchyn remains a favorite within the old-school community. The “Ice Cold” Ukrainian was a wrecking machine when the UFC was still in its infancy, and no one knows why the stocky 5-foot-9 powerhouse never graced the Octagon with his presence.
The Vovchanchyn highlight reel is something to behold and includes one of the greatest knockouts in Pride Fighting Championships history -- a first-round KO of Francisco Bueno at Pride 8 in November 1999. He retired at the age of 32 in 2005.
Number 6 » Ricardo Arona