C.J. Mosley, Ravens inside linebacker

Although his success as a rookie didn't come as a surprise based on his decorated career at Alabama, Ravens inside linebacker C.J. Mosley is worth keeping a close eye on in 2015.

Mosley has the athleticism and instincts to pile up tackles and pressure quarterbacks, which he did regularly in his first NFL season. What's intriguing about Mosley is that he hasn't reached his ceiling. As polished as Mosley is, he can still improve in pass coverage and do a better job of tracking down tight ends and running backs in the open field. It's not a weakness in his game, but it doesn't yet match his run-stopping and blitzing skills.

Lean and tall, Mosley could also use a big offseason in the weight room gaining size strength. Mosley needs to be careful not to overdo it to maintain his speed and flexibility. But with his blend of intelligence, work ethic and talent, he could easily build upon his standout rookie season and have an even bigger year in 2015.