The two-time NL champions are 15-4 since July 22, but lost another player when Ross Gload left with a strained right groin.
Oswalt (7-13) allowed five hits, walked two and struck out five. It was his first win in his third start for the Phillies.
Dodgers starter Clay Billingsley (9-7) gave up two runs and five hits in six innings.
Ryan Madson worked around a leadoff double in the eighth, striking out two batters. Brad Lidge pitched a perfect ninth for his 15th save.
Rockies 6 Mets 2: At New York, Melvin Mora hit a go-ahead grand slam with two outs in the eighth inning for Colorado.
Angel Pagan hit a two-run homer in the first for the Mets and Jonathon Niese hung on to the early lead, but the bullpen came undone.
With two outs in the eighth, Hisanori Takahashi (7-6) gave up a single to Todd Helton and walked Carlos Gonzalez , prompting manager Jerry Manuel to call on Manny Acosta . Acosta’s first offering was a wild pitch that let the runners advance, and Troy Tulowitzki was intentionally walked.
Mora hit his slam — the Mets lead the majors having given up nine this season.
Padres 8 Pirates 5: At San Diego, Kevin Correia took a one-hit shutout into the seventh inning and Jerry Hairston Jr. hit a two-run home run to lead San Diego.
Correia faced the minimum through 6 1-3 innings before the Pirates chased him during a four-run rally in the seventh. Correia (9-7) won for the fourth time in five decisions.
San Diego’s Adrian Gonzalez went 4 for 4 with a walk, drove in two runs and scored twice. Miguel Tejada scored three runs for the Padres, who beat the Pirates for the fifth straight time this season. The West-leading Padres (66-46) have the best record in the NL while the Pirates (39-74) have the worst.
Giants 5 Cubs 4: At San Francisco, Pat Burrell hit a go-ahead solo homer in the eighth inning after an earlier two-run single and Aaron Rowand also homered for San Francisco.
Burrell also made a perfect relay throw from left field that saved an early run for the Giants.
Rowand’s 10th homer of the year, which came in the sixth, gave him seven straight seasons with double-digit home runs.
Burrell’s eighth homer of the year leading off the eighth came off Justin Berg (0-1).
Sergio Romo (5-3) recorded five outs for the win, while Brian Wilson pitched the ninth for his 33rd save.
Giants starter Barry Zito gave up a season-high 10 hits in 6 1-3 innings. His winless stretch extended to five straight starts.
Marlins 9 Nationals 5: At Washington, Mike Stanton had five hits and four RBIs and Chris Volstad won his third game against Washington this season.
It was the third straight win for the Marlins (56-56) and the 18th time this season they have reached .500.
Stanton had the first five-hit game of his two-month career, with a two-run double in a four-run first inning, an RBI single in the second, a double in the fourth, a long home run in the seventh and a single in the ninth. His previous best was three hits.
Stanton’s first double keyed a four-run first inning where Florida batted around against Scott Olsen (3-4), who allowed seven runs and eight hits in 1 2-3 innings — his shortest start since July 8, 2007.
Volstad (6-8) allowed three runs in 16 innings in his first two wins over Washington. In his third, he gave up four runs and eight hits in five-plus innings.
Cardinals 6 Reds 1: At Cincinnati, Colby Rasmus hit his first career grand slam and Adam Wainwright dazzled again to lead St. Louis to the three-game sweep.
The defending NL Central champs, scraped up from a cleat-kicking brawl the previous night, overtook the Reds with their first three-game sweep in Cincinnati since 2005, moving a game ahead in the standings.
Rasmus’ homer off Bronson Arroyo (12-7) broke it open in the fifth.
Braves 8 Astros 2: At Houston, Omar Infante drove in the go-ahead run with a 10th-inning double and Brian McCann added insurance with a grand slam later in the inning to give the Braves a win.
Infante’s hit bounced low on the wall in left field and scored Rick Ankiel to put Atlanta back on top 3-2, giving closer Billy Wagner (6-2) the win after he blew a save in the ninth.
Brandon Lyon (6-5) intentionally walked Melky Cabrera to set up a run-scoring single by Alex Gonzalez that pushed the lead to 4-2 and chased Lyon.
Diamondbacks 8 Brewers 2: At Milwaukee, Arizona tied a major league record by hitting four consecutive home runs, with Adam LaRoche , Miguel Montero , Mark Reynolds and Stephen Drew all connecting in the fourth inning.
The Diamondbacks became just the seventh team in history to accomplish the feat.
Arizona nearly made it five home runs in the inning, but Chris Young flied out to deep center field.
Milwaukee starter Dave Bush (5-10) is the first pitcher in the majors to give up four straight home runs since the New York Yankees’ Chase Wright did it against Boston on April 22, 2007. Wright now pitches for the Brewers’ Triple-A team in Nashville.
