, a seven-time guard known for his toughne s and elite play up front, has decided to step away from the Manny Machado Jersey game.Mankins is retiring after 11 NFL seasons, 161 games and two conference titles, the announced Monday. The 33 year old is believed to be the only player known to play on a torn ACL, and he did so for almost the entire 2011 season. He also played in the that year with a...