CHICAGO -- The Atlanta Braves are on the verge of locking up the National League East title after a 9-5 victory over the Chicago Cubs on Friday.
But there's less certainty with the Cubs, as team president Theo Epstein said manager Dale Sveum was still being evaluated before a decision for 2014 is made on his job status.
"We're going through a necessary evaluation period at the end of the season like we do every year before we make our staffing decisions for next year," Epstein said prior to Friday's game.
The Braves, meanwhile, got their 91st win in the opener of the three-game series at Wrigley Field. They also cut their magic number to clinch the East to one as they snapped a 5-5 tie with four runs in the ninth.
Brian McCann launched the rally as he singled home Jordan Schafer from third with the go-ahead run. Chris Johnson then had a base hit to right to score Freddie Freeman, who had been intentionally walked.
Cubs reliever Kevin Greg loaded the bases with two outs, and Andrelton Simmons doubled in McCann and Paul Janish for a 9-5 lead.
Atlanta had dropped nine of its previous 14 games, yet held an 8 1/2-game lead over second-place Washington entering Friday's game.
David Carpenter, the fifth of six Braves pitchers, got the win in relief. Now 4-1, he worked a scoreless eighth with one strikeout. Right-hander Craig Kimbrel pitched a scoreless ninth.
Gregg (2-5) took the loss after working one inning and giving up four runs on three hits. He was the last of eight Cubs pitchers.
Johnson, who went 3-for-4, clubbed a second-inning home run to right off Cubs starter Scott Baker to give the Braves a 1-0 lead.
Freeman collected his 22nd homer of the season on Baker's 1-0 pitch in the third, driving home Jason Heyward and Justin Upton for a 4-0 Atlanta lead.
Anthony Rizzo got one run back for Chicago when he singled home Starlin Castro with two out in the third off Atlanta starter Paul Maholm.
Maholm doubled to deep right-center in the fourth, scoring Johnson for a 5-1 Braves lead.
Atlanta loaded the bases in the fifth, but Chicago left-handed reliever Zac Rosscup escaped the inning by striking Dan Uggla.
Castro hit a homer off Maholm to open the fifth. The homer, Castro's 10th, came on a first pitch and cut the deficit to 5-2.
Donnie Murphy's sixth-inning solo homer -- his 11th -- trimmed the Braves' lead to 5-3. Mahon departed after that, officially working 5 1/3 innings. He allowed four earned runs on eight hits, and he struck out two.
Reliever Scott Downs was greeted with a run-scoring single by pinch hitter Luis Valbuena that drove home Junior Lake as the Cubs crept to within one run.
Catcher Dioner Navarro tied the game at 5-5 with his 13th home run -- a solo shot to left off Braves left-handed reliever Luis Avilan.
The loss was the Cubs' 90th of the season, giving Sveum a 125-191 record through two rebuilding seasons. But he was matter-of-fact about his status.
"I've been around the game for a long time, and I have been on all kinds of different sides of it," Sveum said. "You know how it all works. You know the process and how it all works."
NOTES: Epstein announced before the game that catcher Welington Castillo is out for the rest of the season with a torn meniscus in his right knee. Castillo closed with a .271 average, eight homers and 32 RBIs in 113 games. ... Baker's strong work in two previous starts led to Friday's appearance. "He's pitching with not quite the velocity he did prior to the surgery, but he's still pitching the way he (previously) pitched," Sveum said. Of 25 Cubs players that suited up on Opening Day only 12 remain on the Cubs active roster. A total of 33 made their club debut this season, eclipsing the mark of 30 set in 1902. ... Heyward was activated from the disabled list on Friday and went 0-for-2 with a walk and a run scored. Heyward suffered two fractures in his jaw after being hit by a pitch Aug. 21 against the Mets and missed 26 games. ... Freeman clubbed his 22nd homer of the season, and he also now has 103 RBIs. It's the first time a Braves batter has 100-plus RBIs since 2007 when Jeff Francoeur (105) and Chipper Jones (102) did it. ... Atlanta sends RHP Kris Medlen (14-12, 3.32 ERA) against Chicago LHP Travis Wood (9-11, 3.05) in Saturday's middle game.