De La Rosa (2-0), who was promoted to the Dodgers from Class AA Chattanooga May 24, made the start in place of the injured Jon Garland and held the Phillies to one run on four hits over five innings, overcoming five walks while fanning four.
Philadelphia's Roy Oswalt (3-4) logged his sixth straight start without a win, allowing four runs on eight hits over six frames.
Placido Polanco and Chase Utley drove in runs for National League East-leading Phillies.
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