THE COMPETITION

Arizona Diamondbacks: The addition of Dan Haren bolsters the reigning division champions’ already strong rotation. How far they go could be determined by how much they get out of Randy Johnson, who is returning from back surgery.

Colorado Rockies: Last year’s Cinderella team returns a lineup filled with players in their primes, including MVP candidate Matt Holliday. Pitching is an area of concern.

San Diego Padres: Jake Peavy leads a pitching staff that led the majors with a 3.70 earned-run average last season. But there are question marks about the back end of the rotation and the offense.

San Francisco Giants: The Dodgers’ longtime rivals and season-opening opponents might be the worst team in the National League. There isn’t much to fear on their roster outside of starting pitchers Matt Cain and Tim Lincecum.