ST. LOUIS (AP) - It's amazing how fast momentum can shift in a World Series. Following Boston's 8-1 win in the opening game where nothing seemed to go right for the Cardinals, St. Louis came right back and took home field advantage away from the Red Sox with last night's 4-2 win in Boston. The series now shifts to St. Louis for games 3, 4 and 5 and if neither team sweeps those games to win the Series, the final two games are slated to be played in Boston next week. The star in last night's win for the Cards was young Michael Wacha who is now 4-0 this post season with a 1.0 earned run average. Wacha allowed just three hits in six innings of work. The St. Louis bats were also potent as after the Sox took a 2-1 lead in the sixth on a two-run home run by David Ortiz, the Cardinals bounced right back with three runs in the eighth. By the way, if you are wondering where Wacha came from, he was selected last year by the Cards with the first-round draft pick received as compensation when Albert Pujols signed with the Los Angeles Angels. The pitching matchup for Game 3 has Jake Peavy going for Boston against Joe Kelly.