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Peterson is out of the lineup for Sunday's game against the Reds.

The lefty-hitting Peterson regularly sits out against southpaws, but he'll head to the bench Sunday even though right-hander Graham Ashcraft is on the hill for Cincinnati. Evan Longoria will pick up a start at third base in place of Peterson, who is slashing .178/.288/.267 in 20 games with Arizona since being acquired from Oakland on July 31.

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