If you watch this guy, on any given possession, you'll understand. Just take your eye off the ball and watch Battier work — the guy acts as if he's in his own reality show, as if the cameras were on him for the entire 24-second turn, even if his man never gets the ball, while appearing deathly allergic to letting people down. Battier just does everything right. It may not mean he'll get the rebound, block or steal — and his guy might still nail the shot — but I've never seen someone pitch as many perfect games defensively.
http://sports.yahoo.com/nba/blog/ball_dont_lie/post/The-top-10-best-defenders-of-the-last-decade;_ylt=AguWIobfTvquo7.Qzi8LTF.8vLYF?urn=nba,185792