Baker was rehabbing from Tommy John elbow ligament surgery in spring training when he re-injured his arm in mid-March, straining a muscle near his elbow. After undergoing an MRI and consulting with the Cubs orthopedic specialist, Dr. Stephen Gryzlo, it was determined that Baker should stop all throwing for at least a month.
Baker played catch from 45 feet Tuesday in his first activity since the muscle strain, but there is no timetable for his return.
Baker, who had the elbow replacement surgery on April 17, 2012, signed a one-year $5.5 million contact with the Cubs on Nov. 13, 2012. He has a lifetime record of 63-48 with a 4.15 ERA.