Four-time Super Bowl champion Rob Gronkowski announces retirement after 11 seasons with Patriots, Buccaneers
Grateful' Gronkowski announces retirement - ESPN
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Ex-Wildcat Rob Gronkowski announces retirement from NFL
Rob Gronkowski announces retirement from NFL – Boston Herald
Rob Gronkowski announces retirement from the NFL
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Patriots tight end Rob Gronkowski announces retirement
Former Patriots TE Rob Gronkowski announces retirement for 2nd time
Patriots TE Rob Gronkowski announces retirement after nine seasons
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