One of a kind' - Four-time Super Bowl champion Rob Gronkowski retires from the NFL for a second time - Eurosport
Rob Gronkowski: Four-time Super Bowl winner retires again, NFL News
Rob Gronkowski retires with 3 Super Bowl rings. What's next for Patriots?
NFL: Rob Gronkowski follows Tom Brady to Tampa Bay
Bucs TE Rob Gronkowski retires from NFL for second time
Rob Gronkowski retires, won't join Tom Brady for 3rd season in Tampa Bay
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All-Pro tight end Rob Gronkowski retires again - The Japan Times
Internet reacts to Rob Gronkowski's retirement announcement - ESPN