The suddenly slumping Phillies aren't ready to panic, but the NL East champions have some definite concerns about their recent play. Brad Peacock, making just his second major league start, pitched 5 2/3 scoreless innings and Michael Morse hit a three-run homer to lead the Washington Nationals to a 6-1 victory over Philadelphia, completing a four-game sweep and handing the Phillies their sixth straight loss.