The Washington Times - July 30, 2011, 05:01PM

Instead of starting tonight’s game for the Washington Nationals, Jason Marquis will pack his bags. A trade to send the right-hander to the Arizona Diamondbacks has been agreed upon, according to Fox Sports’ baseball writer Jon Morosi.

Marquis is in the final season of a two-year, $15 million contract and is a free agent after the season.

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He’s anchored the Nationals’ rotation, going 8-5 with a 3.95 earned-run average over 120.2 innings.

The Nationals obtained Zach Walters, a shortstop at Single-A South Bend, Jim Bowden reported. Walters, a ninth-round pick by the Diamondbacks, is hitting .302 with a .377 on-base percentage and nine home runs. He’s not ranked among the organization’s top-10 prospects by Baseball America. 

This is the Nationals’ third trade of the week, after dealing Jerry Hairston to the Brewers and acquiring Jonny Gomes from the Reds.