Yankees name Opening Day starter with top of rotation set

SARASOTA, Fla. — Aaron Boone made official on Saturday what had been a foregone conclusion after Luis Severino went down with an inflamed rotator cuff. “Masahiro Tanaka will start Opening Day for us,’’ the manager said before the Yankees faced the Orioles at Ed Smith Stadium. “He’ll be followed by [James] Paxton and [J.A.] Happ…