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Around the horn

The Nationals optioned left-handed prospect Matt Purke to Hagerstown as he continues his rehabilitation from surgery on his pitching shoulder. Purke is throwing bullpens at 50 percent of capacity and is expected to be ready to pitch in games by mid-May. … Bo Porter, the former Nationals coach who remains well-liked in the organization, returned Tuesday as manager of the Astros. … Former Nationals prospect Brad Peacock, dealt in the Gio Gonzalez trade, surrendered three hits and two earned runs in ⅔ of an inning. The Astros acquired him from the Oakland Athletics last month in a deal for shortstop Jed Lowrie.