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Both teams are pretty sound defensively, but I would give the upper hand to Arizona for outfield defense.
They have a lot of speed with Chris Young and Justin Upton, who do not let many balls drop. The Giants have Brandon Belt (a converted first baseman), Cody Ross (a natural corner outfield) and Carlos Beltran, who has clearly lost a few steps.
In the infield, I think San Francisco has the edge, especially with Pablo Sandoval and Aubrey Huff at the corner positions. Although they are not speedy, they have quickness and are solid veteran players. Up the middle they have more veteran leadership in Orlando Cabrera and Jeff Keppinger.
The D'Backs have a youthful infield and pales where they had to plug holes with backups. Roberts and Goldschmidt man the corners, but both are inexperienced. John McDonald is past his prime and Aaron Hill has always been known for his stick more than his defense up the middle.
Behind the dish Arizona has the clear edge. Miguel Montero is one of the elite all around catchers in the league, while San Fran is forced to pick and choose with the loss of Buster Posey.
Even though the Diamondbacks win in the outfield and behind the plate, I think that the clear superiority of the Giants infield defense gives them the edge.
Defensive Winner: San Francisco Giants