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With Arizona and Colorado facing off in one of the best three-game series of this weekend, let's take a look at the strengths and weaknesses of the two clubs, with one eye on their matchup and the other on how they line up in the race for the NL West title.

Arizona's strengths

The Diamondbacks' major move this offseason was to add innings sponge Dan Haren to their rotation, slotting him in as the No. 2 starter behind Brandon Webb. Haren, who started last year's All-Star Game for the American League, gains by moving to the easier league but leaves the friendly confines of Oakland's home park, with copious foul ground and deep fences. He follows Webb, one of the best starters in the game, an extreme ground-baller with above-average control.

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