The St. Louis Cardinals will need to re-do their rotation now that ace Jack Flaherty will be sidelined for a while with what manager Mike Shildt termed a “significant” oblique injury. Flaherty leads the majors with eight wins. He exited Monday night’s start against the Dodgers with tightness in his left side. Shildt says the injury is going to take a while to heal. Also, Major League Baseball holds its first Lou Gehrig Day, with teams wearing a commemorative patch on their uniforms. Gehrig, the Hall of Famer who wore jersey No. 4, took over as the starting first baseman for the New York Yankees on June 2, 1925. Gehrig died on June 2, 1941, at age 37 of the disease that carries his name.