But the Nationals hold the edge over Cincinnati head to head in the National League, ensuring the home-field edge in the playoffs. But the Nats' skipper, between 13 years as a player and 16 as a manager, believes he has all the postseason experience the Nationals will need in their first playoff series since returning to Washington. For more than a week, manager Davey Johnson kept saying he wanted right-hander Edwin Jackson to get his 10th victory of the season, and Jackson did just that as the Nationals secured home-field advantage throughout the playoffs by defeating the Phillies, 5-1, at Nationals Park on Wednesday afternoon. The only downer Wednesday for the Nationals: Manager Davey Johnson missed the end of the game after feeling numbness in his left leg, leaving the dugout to get X-rays and treatment from a team doctor. Johnson at 69, the oldest skipper in the majors said he does not expect to have any trouble traveling or managing in the playoffs.