About 2 minutes reading time. BOSTON (AP) — St. Louis Cardinals catcher Iván Herrera was unable to put weight on his left leg and had to be helped off the field after running the bases Sunday during the first game of a day-night doubleheader against the Boston Red Sox. The team announced he had inflammation in his left knee. In an interview on the ESPN broadcast during Game 2, Cardinals manager Oliver Marmol said initial testing was negative and Herrera’s knee was structurally sound.