Michael Wacha worked six innings of three-hit ball in his fifth rain-delayed start of the season and Oscar Taveras homered in his second career at-bat for the St. Louis Cardinals in a 2-0 victory over the San Francisco Giants on Saturday.St. Louis Cardinals' Oscar Taveras watches his solo home run during the fifth inning of a baseball game against the San Francisco Giants Saturday, May 31, 2014, in St. Louis.St. Louis Cardinals' Oscar Taveras rounds the bases after hitting a solo home run during the fifth inning of a baseball game against the San Francisco Giants Saturday, May 31, 2014, in St. Louis.St. Louis Cardinals' Oscar Taveras watches his solo home run during the fifth inning of a baseball game against the San Francisco Giants Saturday, May 31, 2014, in St. Louis.St. Louis Cardinals starting pitcher Michael Wacha throws during the first inning of a baseball game against the San Francisco Giants Saturday, May 31, 2014, in St. Louis.