Joe Blanton gave up two hits in seven shutout innings to outpitch Marlins ace Josh Johnson in the first game, which Philadelphia won 9-3. That reduced to five the Phillies' magic number for clinching the NL East.
Anibal Sanchez allowed two hits in eight innings to beat Philadelphia for the first time in five career decisions, and the Florida Marlins' 3-0 victory gave them a doubleheader split Tuesday.
Sanchez struck out seven and walked two in his longest outing since Sept. 16, 2006. The right-hander, spent two stints on the disabled list this year with shoulder sprains.
Jamie Moyer, who had won his previous eight games in Miami, allowed three runs -- including a pair of solo homers -- in seven innings.
Dan Uggla hit his 30th home run and Cody Ross added a career-high 23rd. NL batting leader Hanley Ramirez had two hits and doubled home the Marlins' other run.
Philadelphia fell to 5-1 in doubleheader games this season.
Facing the NL's highest-scoring team, Sanchez gave up a walk to start the game, then retired 10 in a row before Chase Utley singled. Those were the Phillies' only baserunners until the seventh, when Utley led off with a double but was stranded.
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Philadelphia finished the doubleheader 2 for 16 with runners in scoring position.
Leo Nunez pitched a perfect ninth and completed the two-hitter for his 23rd save in 29 chances. Ryan Howard's flyout near the 434-foot sign in center ended the game.
Blanton struck out nine and walked two. Johnson twice struck out the side and had 10 strikeouts in five innings, but he gave up seven hits and four runs.
"If he doesn't give up any runs, or if he gives up a lot of runs, I still have to go out and pitch and stick with the same game plan either way," Blanton said.
The Phillies' right-hander went six shutout innings in his last start to beat Washington. He said he had better stuff this time, thanks to a slider that had been unreliable of late.
"I finally found it a little bit," Blanton said. "It kind of came back. That was nice. Hopefully it stays."
Blanton allowed no hits after a leadoff single in the second.
The Marlins, beginning their final homestand, ended the night still trailing the defending World Series champions by eight games.
"We know we needed to win," Johnson said. "Blanton went out and threw a great game."
Philadelphia's Raul Ibanez hit his 32nd homer in the opener. Howard and Jayson Werth each had a two-run single for the Phillies, who also scored on a wild pitch, two RBI groundouts and Jimmy Rollins' sacrifice fly.
"I think they hit one ball hard, and it was tough to swallow," Johnson said. "I was trying to battle, make good pitches, and they just hit them. It was just one of those days."
The Phillies won the opener despite striking out 16 times and going 2 for 11 with runners in scoring position.
Facing Sergio Escalano, Florida scored three times in the eighth, with one play destined for the blooper reel. When Hanley Ramirez hit an RBI double, center fielder Shane Victorino chased it down, but when he tried to throw the ball toward the infield, it slipped from his hand and landed at his feet.
Compounding the comedy, Florida's Nick Johnson could have easily scored but didn't see the bobble and stopped at third. Ramirez didn't see Johnson stop and nearly caught up with him at third before retreating safely to second.
Clay Condrey pitched a perfect ninth to complete a five-hitter.
