I know its just one start, but is it possible the WBC took something out of him. The HRs is what really worries me, especially with his walks.
http://www.fangraphs.com/graphs/7775_P_daily_full_4_20090408.png
Courtesy of fangraphs, this compares his 07 and 08 season HR trends. Cutting down on the HRs clearly accounted for some of the 1.50 era swing last year.
Which Matsuzaka are we going to see this year?