The cornerback position is one of the hardest positions to play in all of sports.
Not only must you be quick enough to cover the speedy receivers, but you also have to be tough enough to go up against the big ones as well. Oh, not to mention you have to outsmart Tom Brady, Peyton Manning, and Drew Brees for 60 minutes.
There are a few great young stars in the league right now such as Revis in New York, and Asomugha in Oakland. These guys are great now, but there were others that came before them that set the stage.