Jimmy Nelson was unable to throw Thursday or Friday due to a sore hamstring, MLB.com's Adam McCalvy reports.

Nelson was unable to throw Thursday or Friday due to a sore hamstring, MLB.com's Adam McCalvy reports.

Analysis:

Manager Ron Roenicke does not believe Nelson's setback is serious, so it seems the Brewers are just being cautious with the regular season over a month away. Assuming Nelson is healthy come Opening Day, he will open the season as the Brewers' fifth starter.