The Nationals, who snapped a nine-game losing streak to Atlanta on Wednesday, allowed their NL East rivals to get only three runners in scoring position over two nights.
Haren (3-3) won his second consecutive start, giving up four hits and one run with one walk and four strikeouts.
Washington got off to a good start in the first off Kris Medlen, breaking its 15-game streak without a first-inning run.
Medlen (1-4) lost his third straight start, allowing seven hits, three runs and three walks in seven innings. He struck out eight.
CARDINALS 6, BREWERS 5
MILWAUKEE (AP) — Jake Westbrook allowed one run over six innings for his 100th career win and the Cardinals held off the Brewers.
Westbrook (2-1) walked three and struck out four. The Brewers were 1 for 8 with runners in scoring position against him.
Westbrook allowed Norichika Aoki's double to open the game and then nothing more until one out in the fourth when the Brewers pushed across a run on three consecutive singles. He struck out Alex Gonzalez and then fanned Wily Peralta (2-2), his third strikeout of the inning.
Westbrook left with a 6-1 lead for the relievers to protect, but the Brewers scored twice in the seventh, one in the eighth and one in the ninth.
PHILLIES 7, MARLINS 2
PHILADELPHIA (AP) — Ryan Howard and Domonic Brown hit solo homers to back Kyle Kendrick and the Phillies beat the Marlins.
Kendrick (3-1) allowed two runs and seven hits in seven innings to earn his ninth straight win against the Marlins, dating to May 28, 2010.
Justin Ruggiano hit a solo shot for Miami. Alex Sanabia (2-4) gave up four runs — two earned — and six hits in five innings.
PADRES 4, CUBS 2
CHICAGO (AP) — Yonder Alonso's two-out fly ball to right field dropped in front of Julio Borbon for an RBI single that led to a four-run eighth inning and boosted the Padres over the Cubs for a four-game series split.
Travis Wood (2-2) retired his first 14 batters before Kyle Blanks singled, and he led 2-0 when Jesus Guzman reached on an infield single leading off the eighth. San Diego went ahead with just one hard-hit ball in the inning, taking advance of two infield hits, the shallow fly and a passed ball.
Joe Thatcher (2-0) pitched one-third of an inning for the win.