From the official site:

Hideki Matsui was cleared to take full batting practice for the first time on Tuesday, a big step in his hopeful return to the Yankees' lineup this season. Matsui is scheduled to hit indoors on Wednesday.

Matsui had no problems with soft-toss hitting drills on Sunday, but he hasn't taken live batting practice yet. The Yankees originally thought Matsui wouldn't be ready until some time later this week.

"In terms of being pain free, that's something I definitely feel good about and very satisfied," Matsui said through his interpreter. "I'm still working on my mechanics and things like that."