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07/12/08 12:05 AM ET

Young leaves due to back tightness

WASHINGTON -- Nationals first baseman Dmitri Young left Friday night's game against the Astros in the fourth inning with right lower back tightness. He is listed as day-to-day.

With Houston right-hander Chad Paronto on the mound, Young fouled off the first pitch of the at-bat, and then grimaced in pain. Young left the game soon thereafter, and he was replaced by Pete Orr.

Washington manager Manny Acta doesn't expect Young to be placed on the disabled list. Young is hitting .280 with four home runs and 10 RBIs this season.

Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.