"It'll be a quick hour, that's why today I wanted optional," Roberts said before Game 5. "Ground balls, guys doing flat work. Pitchers need to throw, guys take a few rounds of batting practice. It's going to be cold, get used to that."
The series resumes on Saturday for Game 6, with the Dodgers starting Clayton Kershaw against the Cubs' Kyle Hendricks, and Game 7 will be on Sunday, if necessary.
Ken Gurnick has covered the Dodgers for MLB.com since 2001.