Leiter, who entered the contest with a 7.53 ERA on the road, held the Nats to four runs on six hits while striking out eight. Fellow rookie Rhys Hoskins drilled his 14th home run in 30 games, while Cesar Hernandez picked up three hits for the Phillies to extend his streak of consecutive games reaching base to 20.
Michael A. Taylor almost brought the Nationals back from a four-run deficit, blasting a two-run home run in the fourth before driving in former Phillie Howie Kendrick with a single in the sixth.