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At least he acknowledged something - Sportscaster Bob Costas once publicly endorsed former MLB All-Star Mark McGwire's live PED admission of 2010

Mark McGwire nicknamed 'Big Mac,' is an American former professional baseball player currently…

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PHOTO: Mark McGwire and Bill Murray hanging out during the 1990 All-Star Game at Wrigley Field. : r/baseball

St. Louis Cardinals legend Mark McGwire opened up about PED use in 2010: I wish I was never a part of it

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