#6 Nick Diaz
Nick was maybe one of the most exciting fighters to ever enter the Octagon. He is the oldest of the two Diaz brothers and has fought some brawlers in his time. Who can forget him mocking Anderson Silva, who is one of the greatest P4P fighters in the world.
Nick was close to winning the UFC belt on two occasions one against St. Pierre and the other against Anderson Silva, both which he lost by decision. The Anderson fight was later changed to a no contest after testing for multiple performance-enhancing drugs.
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Also, he has lost a lot of time in his career due to his ban for using Marijuana which ends this August. He might be involved in some big fights if he returns but still has a bleak chance of winning the tile.