Francisco Rodriguez kept the Cardinals off the board in the ninth inning, earning his ninth save and preserving Monday's 1-0 victory.
Mike Fiers fired six shutout innings to earn the win against the Cardinals on Monday.
Carlos Gomez went 2-for-4 with an RBI single, providing the Brewers their only run as they staved off the Cardinals on Monday.
Tyler Cravy is in line to start on Tuesday against the Cardinals.
Brewers activated C Jonathan Lucroy from the 15-day disabled list.
Brewers optioned C Juan Centeno to Triple-A Colorado Springs.
Brewers purchased the contract of RHP Tyler Cravy from Triple-A Colorado Springs.
Brewers optioned RHP Tyler Wagner to Double-A Biloxi.
Martin Maldonado hit a walk-off home run in the 17th inning to give the Brewers a 7-6 win over the Diamondbacks on Sunday.
Making his major league debut against the Diamondbacks on Sunday, Tyler Wagner allowed five runs on nine hits over 3 2/3 innings.
Mike Fiers will start for the Brewers on Monday against the Cardinals in St. Louis.
Brewers outfield prospect Michael Reed ripped four hits in Saturday's win for Double-A Biloxi.
Adam Lind is not in Sunday's lineup due to a back injury.
Brewers purchased the contract of RHP Tyler Wagner from Double-A Biloxi.
Brewers placed OF Khris Davis on the 15-day disabled list with a torn meniscus in his right knee.