Lance Berkman will get an MRI on his left calf Thursday. Berkman was pulled from Tuesday's game against the Reds after feeling tightness in the calf and did not play Wednesday. He could need a stint on the disabled list if the MRI reveals a strain. Matt Carpenter has been filling in at first base for the Cardinals, who have their home opener Friday afternoon against the Cubs. Berkman also struggled with calf issues during the 2009 season.