CHICAGO -- Jeff Bianchi drove in a pair of ninth-inning runs as the Milwaukee Brewers completed a Tuesday sweep with a come-from-behind 3-2 victory over the Chicago Cubs in the nightcap of a day-night doubleheader.
With two out and the bases loaded, Bianchi lined a clutch base hit to left field for the tying and go-ahead runs.
Milwaukee also beat Chicago 6-5 in the opener as Jean Segura doubled home Norichika Aoki in the seventh inning for the winning run.
Kevin Gregg, the third Cubs pitcher of the night, gave up singles to Juan Francisco and Segura and then walked Logan Schafer before facing Bianchi in the decisive at-bat.
Gregg missed a chance for his 23rd save and instead fell to 2-3 for the season.
Brewers right-hander Jim Henderson allowed one baserunner with two out in the ninth and struck out Junior Lake to end the game and collect his 14th save.
The Cubs entered the inning with a 2-1 lead after David DeJesus doubled home two runs in the seventh.
Right-hander Tyler Thornburg had no decision in his first career Brewers start. He gave up four hits, struck out six and walked three in six scoreless innings.
Starter Jake Arrieta also pitched six innings in his Cubs debut, allowing two hits and one earned run. He walked three and struck out two.
DeJesus gave the Cubs their only lead in the seventh with his two-run double off the wall in right-center.
Cody Ransom and Cole Gillespie had reached base on back-to-back Brewer errors and advanced on a passed ball by reliever Burke Badenhop.
Badenhop (2-3) got the win after working the seventh and eighth innings.
Milwaukee threatened in the eighth when Schafer walked and reached second on a balk with none out. He advanced to third on Jonathan Lucroy's sacrifice fly to right. Cubs reliever Michael Bowden got left fielder Khris Davis to fly out to left to end the inning.
Francisco's fifth inning solo home run broke a scoreless tie. Francisco sent Arrieta's 0-1 pitch into the left-field bleachers for his 14th homer of the season, giving the Brewers a 1-0 lead.
NOTES: Arrieta made his Cubs and National League debut in Game 2. He was 20-25 with a 5.46 ERA in two partial seasons with the Baltimore Orioles. ... Thornburg made his seventh appearance and first start since begin recalled from Triple-A Nashville on June 29. ... Monday's doubleheader was the first at Wrigley Field since June 28, 2011. The opening game made up an April 10 rainout. The Cubs have not swept a doubleheader since Aug. 13, 2008, at Atlanta. ... Milwaukee sends RHP Wily Peralta (7-10, 4.54 ERA) against Chicago RHP Edwin Jackson (6-11, 4.89 ERA) in Wednesday's series finale. ... After Tuesday's second game, the Brewers were 37-22 when scoring at least four runs in a game, compared to 9-39 when scoring fewer than four.