Tiki Barber has a bad hamstring.

Teams haven't been able to handle its sheer speed because, at times, it seems like it's running circles around the competition. Of course, we're talking about the Rams' defense, which has been playing bigger than its size due to its ability to swarm opposing offenses. Lovie Smith's new and improved St. Louis D will have to get physical with the Giants, particularly against New York's power running game, according to ESPN's Sean Salisbury.