Philly took the first two games, 9-0 and 6-3, and on Wednesday, Roy Oswalt bids for the sweep.
Another right-hander, Brandon Beachy, goes for the Braves.
Oswalt was decent in his one start against Atlanta this season, allowing two runs (one earned) in six innings, although that was all the way back in April. Philly won, 10-2. Oswalt's numbers are even from the first half to the second half, but he's actually fared slightly better away from Citizens Bank Park, with a 4.03 ERA at home compared with 3.62 on the road.
Rolling toward October, the Phillies earned their 90th win on Tuesday faster than any season in their past, doing so in game No. 138. The previous fastest came in 1977, when they did it in 143 games.
Atlanta has lost its last two series.
"We have enough good players, enough confidence, enough resiliency that we'll get out of it and start clicking on all cylinders again," Braves manager Fredi Gonzalez said after Tuesday's loss.
Beachy's been strong since his last loss, way back on July 19. In eight starts since, he's allowed more than three earned runs in a start once, and is 4-0. He's made three starts against the Phils this season, but they've roughed him up to the tune of a 5.79 ERA. He allowed the same number of runs to them (nine) as strikeouts in a combined 14 innings.
Beachy's gone exactly six innings in each of his last three starts, the last a no-decision in an 8-6 loss to the Dodgers on Friday. Most impressive about his season might be his strikeout numbers: He ranks second among all Major League rookies with 135 strikeouts, and he has a 10.1 strikeouts-per-nine-innings ratio.
Only three rookie starters in Major League history have produced a better ratio: Kerry Wood (12.58 in 1998), Dwight Gooden (11.39 in 1984) and Hideo Nomo (11.1 in 1995).
"He's got an interesting mix right now," Braves general manager Frank Wren said. "He can spot the fastball, and he can also elevate it. He has gotten a lot of his strikeouts elevating his fastball."
After Wednesday's finale, the Braves and Phillies are scheduled to meet one more time, in their final series of the regular season. The three-game set in Atlanta begins on Sept. 26.
Braves: Kimbrel takes second monthly award
Closer Craig Kimbrel received his second National League Rookie of the Month Award on Tuesday, after taking it home in June. He's one of 10 National Leaguers to receive the honor twice, the previous being his teammate Jason Heyward, who did it last year.
"I'm not really worried about awards or anything like that," Kimbrel said. "I'd trade both of them just to get through the playoffs."
Phillies: LaMar, assistant general manager, steps down
Chuck LaMar resigned from his position as assistant general manager on Tuesday. The Phils plan to fill the position, but not immediately.
LaMar joined the Phillies in October 2007 as the director of pro scouting, and he became assistant GM of player development and scouting in November 2008.
Amaro met with LaMar and fellow assistant GM Benny Looper on Tuesday morning.
"After having some discussion, it seemed like for Chuck, the best situation for him was to go ahead and resign," Amaro said. "Just more of a disappointment."
Cliff Lee on Tuesday was named the NL Pitcher of the Month for August.
The Phillies' 6-3 win on Tuesday gave them a franchise-best fourth straight 90-win season. Before this run, Philadelphia won 90 games or more in three straight seasons only once, from 1976-78. The Phils have 14 90-win seasons all time.