Biggest 'what if' athletes of all time

Associated Press
FILE - This July 11, 1989, file photo shows Kansas City Royals'  Bo Jackson watching the flight of his first-inning home run during the All-Star Game, in Anaheim, Calif. Jackson was an All-Star major leaguer and a Pro Bowler in the NFL. (AP Photo/Leonard Ignelzi, 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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