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10. Mike Tenay
Sure many people credit "The Professor's" work in TNA as largely a failure, but prior to being paired up with the abysmal Don West, Mike Tenay was one of the best commentators in the business during WCW's heyday against WWE. His knowledge of the business as well as wrestler/promotion statistics is unparalleled, and he used it to his advantage calling some classic bouts in WCW.