Diamondbacks acquire reliever Rauch from Nationals

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The Arizona Diamondbacks acquired reliever Jon Rauch from the Washington Nationals for prospect Emilio Bonaficio on Tuesday.

Rauch was 4-2 with 17 saves in 22 chances and a 2.98 ERA for the Nationals. He has been filling in at closer for most of the season for injured Chad Cordero.

Bonaficio entered the season as Arizona's No. 6 prospect, according to Baseball America. The speedy second baseman was recalled by the Diamondbacks on July 4, and was 2-for-12 in eight games.

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