#6 Carlos Condit
Condit kickstarted his MMA career back in 2002 and has been in the game for over 16 years. The "Natural Born Killer" has never been knocked out in his career despite suffering a torn ACL and meniscus in his fight with Tyron Woodley.
Condit has fought at the highest level for quite some time now, fighting top-tier talents such as George St. Pierre, Tyron Woodley, Rory MacDonald, Dan Hardy, Robbie Lawler, Thiago Alves, Martin Kampmann, Johny Hendricks, and Nick Diaz.
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The insanely creative American has been dropped twice by Jake Ellenberger and by Robbie Lawler but there's no shame in that. Condit is still active and is set to fight on April 14th against another knockout artist in Matt Brown.