Brilliant rookie Jordan Walker wins the opening day spot as the Cardinals round out their roster
PORT ST. LUCIE, Fla. — Before he welcomed St. Louis and continued Jordan Walker’s brilliant ascension as the Cardinals’ top prospect for a generation, manager Oliver Marmol first had a question. In the manager’s office at Roger Dean Stadium on Saturday afternoon, with Walker sitting across from him and bench coach Joe McEwing nearby, Marmol …