Adam Wainwright won’t pitch in exhibition games until mid-March because of his abdominal strain, a delay that could prevent the St. Louis Cardinals’ ace from starting the major-league season opener at the Chicago Cubs on April 5. Cardinals manager Mike Matheny is open to the idea of pushing back Wainwright’s season debut a couple of days if the right-hander doesn’t respond to rest as quickly as doctors expect. Matt Harvey drew an ovation from the crowd of 100-150 fans and high-fives from teammates after stepping off the mound in Port St.