Marcus Mariota has started the process of getting used to being under center as an NFL quarterback, and the Tennessee Titans liked what they saw on the field. The Heisman Trophy winner and the No. 2 draft pick overall was happy to be back on the field during the first day of rookie minicamp on Friday. Coach Ken Whisenhunt has promised the Titans are incorporating some of the spread offense that Mariota ran at Oregon into his scheme to make the QB's transition as smooth as possible. ''It's just getting repetitions.'' After months of draft questions, workouts and waiting, the 6-foot-4, 222-pound quarterback was just happy being on a football field. More...