Franklin was promoted from High-A Peoria to Double-A Springfield on Tuesday.
Franklin had been on a roll in his last four starts with Peoria, logging a 1.83 ERA and 28:2 K:BB over 19.2 innings. The hard-throwing righty can lose the strike zone on occasion -- he's sporting a 10.3 percent walk rate for the season -- but Franklin has emerged as one of the Cardinals' better pitching prospects as he transitions from college reliever to minor-league starter.