ST. LOUIS - UNDATED: Mark McGwire #25 of the St. Louis Cardinals watches the flight of the ball as he follows through on his swing during a game against the Colorado Rockies circa 1997-2001 at Busch Stadium in St. Louis, Missouri. (Photo by Ron Vesely/MLB Photos via Getty Images)

ST. LOUIS - UNDATED: Mark McGwire #25 of the St. Louis Cardinals watches the flight of the ball as he follows through on his swing during a game against the Colorado Rockies circa 1997-2001 at Busch Stadium in St. Louis, Missouri. (Photo by Ron Vesely/MLB Photos via Getty Images)
ST. LOUIS - UNDATED: Mark McGwire #25 of the St. Louis Cardinals watches the flight of the ball as he follows through on his swing during a game against the Colorado Rockies circa 1997-2001 at Busch Stadium in St. Louis, Missouri. (Photo by Ron Vesely/MLB Photos via Getty Images)
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