2015 NFL Draft: Mike Mayock's Top 5 Quarterbacks

Oregon's Marcus Mariota during the first half of the NCAA college football playoff championship game against Ohio State Monday, Jan. 12, 2015, in Arlington, Texas. (AP Photo/Eric Gay)

FILE - In this Jan. 1, 2015 file photo, Florida State quarterback Jameis Winston looks to throw during the first half of the Rose Bowl NCAA college football playoff semifinal against Oregon in Pasadena, Calif. Jameis Winston met with the Tampa Bay Buccaneers, Tuesday, March 3, 2015, hoping to make a good impression on the team considering taking the Heisman Trophy-winning quarterback with the first pick in the NFL draft. (AP Photo/Mark J. Terrill, File)

Baylor quarterback Bryce Petty (14) celebrates a touchdown pass during the second half of the Cotton Bowl NCAA college football game Michigan State, Thursday, Jan. 1, 2015, in Arlington, Texas. (AP Photo/LM Otero)

Colorado State quarterback Garrett Grayson calls signals against Hawaii in the fourth quarter of Colorado State's 49-22 victory in an NCAA college football game in Fort Collins, Colo., on Saturday, Nov. 8, 2014. (AP Photo/David Zalubowski)

UCLA quarterback Brett Hundley passes during the first half of an NCAA college football game against Southern California, Saturday, Nov. 22, 2014, in Pasadena, Calif. (AP Photo/Mark J. Terrill)