A decision that had been hinted at for weeks became official on Sunday when manager Mike Matheny confirmed that Michael Wacha will begin the season in the Cardinals' rotation.
St. Louis Official Site
If they survive the next two weeks, the Cardinals intend to start the season with the rotation that was obvious when an injury found them in the opening hours of spring training.
The answer has become more and more clear each time Michael Wacha has taken the ball this spring, so it was of little surprise when the reports came before today’s game that Mike Matheny announced the right-hander would open the season in the St. Louis Cardinals starting rotation.
STL Baseball Weekly