Yankees manager Joe Torre said before Saturday's game that Gary Sheffield will be his postseason first baseman, and Jason Giambi will be a designated hitter. That decision means one player won't be able to start from among Giambi, Hideki Matsui and Melky Cabrera. "It's a lot about his personality that probably helped feeling comfortable with him over there," Torre said of Sheffield. "He's a little more agile in moving around there at this point in time."