Due to a suspension and injuries, Oswalt won't have quite the same lineup to back him when he faces the Nationals for the second time in less than a week Friday night in the nation's capital.Oswalt (5-7, 3.84 ERA) allowed three runs over seven innings Saturday and got eight runs from his teammates in an 11-3 rout. The win was his first since June 12, and first in two starts since returning from lower back inflammation.Oswalt entered Saturday's game 1-7 with a 4.73 ERA and a 2.03 run-support average over his previous 10 starts."Overall my fastball is coming back and I feel healthy," he said. "It's just a matter of getting out there, getting strength and durability, that's the biggest thing."Shane Victorino had two hits and scored two runs Saturday, but will finish serving a two-game suspension in this contest. Ryan Howard, who homered and drove in four runs to support Oswalt, missed Thursday's 4-1 victory over Arizona due to a sore right hand.He's day to day, as is Carlos Ruiz (groin), who could return Friday. Placido Polanco, however, won't appear at all in this series after being placed on the disabled list Wednesday with a sports hernia.With all those hitters out, John Mayberry Jr. stepped up to hit a key two-run homer Thursday and help the Phillies earn their 15th victory in 18 games.Oswalt will now try to help Philadelphia (80-42) improve to 12-1 in its last 13 on the road by earning his first victory in Washington since July 21, 2005. He made his debut for the Phillies at Nationals Park last July following a trade from Houston and suffered the defeat in an 8-1 loss.Oswalt is 0-2 with a 3.38 ERA in three starts for Philadelphia in the nation's capital, received just one run of support in each game. He gave up two runs over five innings June 1 and wound up on the wrong end of a 2-1 score.This time, he'll face a Nationals lineup that's batting .227 over its last nine games.Washington (59-63) fared a bit better in Thursday's 3-1 victory over Cincinnati, totaling eight hits including a two-run single by Jonny Gomes against his former team. Gomes had been 0 for 14 in his previous six games."It's not like we took two out of three from the Reds, and now my season's over," he said.Livan Hernandez (7-11, 4.21) will aim for a similar performance to his most recent outing. The veteran right-hander allowed one unearned run in 6 2/3 innings of last Friday's 4-2 win at Philadelphia, improving to 2-1 with a 3.12 ERA in four matchups with the Phillies this season. His 13 career wins against Philadelphia lead all active pitchers.