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UFC Moscow: Can Greg Hardy solve Alexander Volkov?

Greg Hardy, left, will be facing the stiffest test of his MMA career when he meets Alexander Volkov (30-7) on Saturday. Josh Hedges/Zuffa LLC/Getty Images

Alexander Volkov was originally set to face former UFC champion Junior dos Santos in the main event of UFC Moscow on Saturday, but Dos Santos pulled out of the fight and created the biggest fight in former NFL star Greg Hardy's budding MMA career.