Rob Gronkowski retires, won't join Tom Brady for 3rd season
Rob Gronkowski Announces Retirement From The NFL – Hollywood Life
Rob Gronkowski announces retirement from NFL – Boston Herald
Rob Gronkowski Announces NFL Retirement for Second Time (UPDATE
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Buccaneers tight end Rob Gronkowski retires for second time
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Rob Gronkowski announces his retirement
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Rob Gronkowski announces retirement from the NFL
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Rob Gronkowski announces retirement from NFL for second time