The St. Louis Cardinals and Los Angeles Dodgers are quite familiar with each other because of the last two postseasons, and they could be on course for another October showdown. Michael Wacha is certainly ready. ''That's a long time away, but both teams are playing good baseball and you never know what will happen,'' Wacha said Thursday night after pitching the Cardinals past the Dodgers 7-1 in the opener of a four-game series between the National League's top two teams.