The Astros placed second baseman Kazuo Matsui on the 15-day disabled list with an irritated disk in his back Saturday and purchased J.R. House's contract from Triple-A Round Rock. Matsui left Tuesday's game against San Francisco with a sore back and will go on the DL for the third time this season. He missed the first 16 games while recovering from surgery to repair an anal fissure, then sat out 15...

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