The Braves clinched their first NL East title since 2005 before the game was completed when the Miami Marlins downed the Washington Nationals in the first game of a doubleheader.
Freddie Freeman also went deep for Atlanta, which took two of three from Chicago.
Julio Teheran (13-8) earned the decision, yielding one run on four hits while striking out seven over six innings.
Cubs starter Edwin Jackson (8-17) took the loss, surrendering three runs on eight hits in six full innings.
Exploding whale video goes viral on Internet
Reindeer recovered after escaping from Santa during lighting ceremony