CHICAGO -- Cubs first baseman Anthony Rizzo had to leave Saturday's game because of back spasms but did not expect to miss Sunday's series finale against the Reds.
"It just started barking on me in the fifth or sixth, and once we took the four-run lead, I [decided to] play with more caution than go up there, get another at-bat and go out on the field and hurt it even more," Rizzo said.
He was lifted defensively in the eighth inning, and Mike Olt moved from third to first.
Cubs manager Rick Renteria said Rizzo might have aggravated his back stretching for a high throw on a pickoff attempt.
"I felt it a little bit [Friday]," Rizzo said. "It'll probably be gone tomorrow or the next day. The play on the pickoff that was kind of high, that's when it started barking the most."
The first baseman expected to be a little sore on Sunday but didn't think it would keep him out of the lineup.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.