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07/31/09 5:06 PM ET

Norris to replace Oswalt on Sunday

Right-hander will take on Cardinals in first MLB start

ST. LOUIS -- Astros pitcher Bud Norris said Friday he will make his first Major League start Sunday against the Cardinals in place of the injured Roy Oswalt.

Oswalt, who left his start Tuesday in Chicago with a strained left back, rejoined the team Friday and threw in the outfield at Busch Stadium.

Norris threw three innings in his Major League debut Wednesday against the Cubs.

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