Coming off its first World Series title since 1908, Chicago (87-68) won three of four in the weekend series and opened a 5½-game lead over the second-place Brewers (82-73) with seven games remaining. Milwaukee began the day one game behind Colorado for the NL's second wild card.
Quintana (7-3 with Cubs, 11-11 overall) struck out 10 and walked one in his second complete game in 182 starts. He threw 116 pitches, his most since Sept. 7 last year.
He did not allow any extra-base hits and retired his final 11 batters after walking Domingo Santana in the sixth.
