Johnny Manziel is concentrating only on football after a fun-filled weekend in Las Vegas. The Browns' celebrated rookie quarterback is on the field Wednesday with his teammates for the second day of Cleveland's organized team activities. Manziel returned to work Tuesday following a well-documented jaunt to Vegas, where he hung out with Patriots partying tight end Rob Gronkowski, attended a UFC fight and enjoyed the nightlife. Manziel worked with Cleveland's second-team offense during 11-on-11 drills. More...