The St. Louis Cardinals are calling up outfielder Oscar Mercado from the minors for Wednesday's game, which would indicate that outfielder Dylan Carlson (ankle) is headed for a stint on the injured list. Carlson suffered a sprained left ankle on Sunday and isn't quite ready to return to action for the Red Birds. Giving the struggling 24-year-old some more time off probably won't hurt, as he's hitting only .230 (23-for-100) with four doubles, a triple, two home runs, 12 RBI and 12 runs scored ...