By SCHUYLER DIXON
Dallas Cowboys center Travis Frederick is retiring from the NFL at 29. The surprising decision comes less than two years after Frederick was diagnosed with a neurological disorder that sidelined him for all of 2018. Frederick returned last year and made the Pro Bowl. But Frederick was clear in a statement announcing his retirement that he wasn’t the same player from before the diagnosis of Guillian-Barre syndrome. The auto-immune disease attacks the nervous system and causes weakness. Frederick was a first-round pick seven years ago.