St. Louis’s Aledmys Diaz rounds the bases after hitting a solo home run in the first inning on Saturday. (AP Photo/Jeff Roberson) Associated Press ST. LOUIS – Michael Wacha’s first start of the season was just what the St. Louis Cardinals wanted. Wacha pitched six fine innings and the Cardinals, behind two home runs from Aledmys Diaz, beat the Cincinnati Reds 10-4 Saturday to spoil Bronson Arroyo’s return to the majors. “Michael was great,” Cardinals manager Mike Matheny said. Reds manager Bryan Price thought Wacha looked like his old self. “Velocity was back up,” Price said.