Biggest 'what if' athletes of all time

Associated Press
FILE - This Aug. 18, 1967, file photo shows Gale Sayers (40) of the Chicago Bears grinding out yardage against the Green Bay Packers before being brought down by Bob Jeter (21) at the Midwest Shrine exhibition game in Milwaukee. The Bears and Packers have played 181 times, with Chicago holding a 92-83-6 edge. Between them, they've won 21 NFL titles and sent four dozen players to the Hall of Fame.  (AP Photo/File)

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Grant Hill's retirement got us to thinking about other athletes whose careers were cut short or hampered by injury. While this isn't the definitive list of stifled greatness, we came up with some pretty big names. Who else should be on the list?

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