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The Astros placed Pena on the 10-day injured list Wednesday with left thumb discomfort.

Though general manager James Click said in a radio appearance earlier Wednesday that Pena's thumb injury wasn't severe, the American League Rookie of the Year candidate will remain sidelined through at least next weekend while he heals up. Manager Dusty Baker said Wednesday that the 24-year-old underwent an MRI that didn't reveal any significant damage, but the shortstop won't swing a bat for at least a week, Chandler Rome of the Houston Chronicle reports. Aledmys Diaz started at shortstop in Tuesday's 4-3 win and will likely serve as the primary option at the position while Pena is on the shelf.

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