D-backs acquire Marquis from D-backs

Trying to keep pace with the Giants, the Diamondbacks have acquired veteran right-hander Jason Marquis from the Nationals.

Washington gets minor league infielder Zach Walters, who was a ninth-round pick in the 2010 draft.

Marquis is 8-5 with a 3.95 ERA in 20 starts for Washington and has allowed eight home runs.

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