Best NFL rookies 2014: Teddy Bridgewater, Aaron Donald, more - NFL - SI.com

Safeties: Pierre Warren, New Orleans Saints/Ha Ha Clinton-Dix, Green Bay Packers

New Orleans' defense has been a hot mess most of the season, but Warren, the only undrafted player on our list, has still distinguished himself by picking off two passes and allowing no touchdowns all season in 348 snaps. He's been burned deep from time to time, and he needs to develop as a run support player, but there's a lot to like there.

Clinton-Dix was even better, allowing no touchdowns and picking off one pass in 889 snaps. The 21st overall pick, he's also proven to be a strong player in blitz packages and when asked to stop the run as a box player or force defender.