Top breakout players in 2015: Nos. 30-21

We’re entering a college football season without a star even close to the level of Johnny Manziel, Jameis Winston or Marcus Mariota, the past three Heisman Trophy winners. But that means there is just more room for breakout performances.

Beginning Monday and continuing through Friday, we'll lay out the top 50 breakout candidates for 2015, based on conversations with several head coaches.

Today: Nos. 30-21. Included, two Pac-12 coaches love the growth potential for the improving quarterbacks; Alabama hopes it has its next stud receiver; and difference-making pieces for defenses at Texas, Texas A&M, Ole Miss and Clemson.