Four-time Super Bowl champion Rob Gronkowski announces retirement
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Bucs Tight End Rob Gronkowski Gives Timeline for Retirement
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Rob Gronkowski of New England Patriots Retires From Football
Rob Gronkowski Contacted Bucs This Season About Potential Return
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Tampa Bay Buccaneers TE Rob Gronkowski retiring from NFL for
Rob Gronkowski reveals Brain Daboll 'has the best chance' of luring
Tom Brady Discusses Potential Rob Gronkowski Comeback Amid
Rob Gronkowski posts curious response to report that he's playing
Rob Gronkowski Announces NFL Retirement for Second Time (UPDATE
Rob Gronkowski teases next move with cryptic note about his 'dream
Rob Gronkowski Doesn't Miss Football - The New York Times