"We have the flexibility of right-handed, left-handed matchups," Renteria said Saturday. "Someone asked about guys getting comfortable on a daily basis [if not playing every day], and I think we're trying to put everybody in the best possible position for success based on guys they've faced. You'll see us double up and play against righties [against right-handers] and lefties [against left-handers]. It depends on where we're at and what we see is the right fit."
Last season, the Cubs struggled against left-handed pitchers, batting .232, which ranked last in the National League.
One player who has started every day is first baseman Anthony Rizzo, who was 1-for-9 against lefties this year. Last season, he batted .189 against lefties, .252 against right-handers.
"The more he continues to face lefties, the more he's adjusting his approach," Renteria said of Rizzo. "I think over the long haul it'll start to improve, but you can't do it unless you're out there. A lot of our other guys also, there will be times when they're facing some lefties, and people will probably wonder why, but you have to give them the opportunity to see them at some point."
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.