CINCINNATI -- Right fielder Ryan Braun, who has already missed a number of games this season with thumb and rib cage injuries, exited Saturday's game against the Reds with lower back spasms.
Braun struck out swinging in the first inning and played the bottom of the frame on defense, but Logan Schafer stepped into the lineup in Braun's spot in the top of the second. Schafer was stranded on deck, but took over on defense in the bottom of the inning.
"Back tightness, felt it today in [batting practice] and thought he was able to get through the game," manager Ron Roenicke said. "Obviously, he couldn't do it."
Braun will be re-evaluated on Sunday before the Brewers and Reds play the rubber match of their three-game series.
An 0-for-3 night on Friday snapped Braun's hitting streak at eight games, though Roenicke had been encouraged lately by Braun's better swings. He was hampered earlier this season by an inflamed nerve near the base of his right thumb, and was on the disabled list for two weeks in early May with a right rib cage strain.
Adam McCalvy is a reporter for MLB.com. Read his blog, Brew Beat, and follow him on Twitter at @AdamMcCalvy. This story was not subject to the approval of Major League Baseball or its clubs.