I definitely think Adamek could beat Haye, he has way enough power, stamina and movement for that plus his speed is very decent too.
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I give Arreola a better shot at beating Haye. He can punch, has a great chin and would keep pressuring Haye late in the fight...if it went into the later rounds. Adamek on the other hand, stands way too upright for Haye IMO. He's a sucker for David's overhand right.