What's wrong with...

... Hideki Matsui?
After he punished the Red Sox in the first games of the season hitting two homeruns and .440, .481, .760 overall (OPS 1.241!), Matsui was a sure thing MVP for many. One month later, Matsui is hitting .231, .316, .385 (OPS .701). And things are getting worse, as Matsui hit .208, .303, .327 over the last 30 days and .160, .267, .280 in the last week in 25 AB.
So what's wrong with him?
I have no idea, of course. The games against the Red Sox should have given him a lot of confidence, but today his slump has really gotten to his head. He looked completely lost in the game against the A's today, going 0-4 with 2 Ks, taking a called third strike right down the middle.
As a Yankee hater, I don't really mind a Yankee being in that kind of slump, but I wonder if or when he will break out of it. Of course, I don't expect Matsui to hit under the Mendoza line for too long, but he certainly isn't used to this kind of struggles, so it might affect him for a little longer.