In spite of the injuries and lack of hitting production from some of the Sox high priced regulars, their main problem continues to be pitching. They are among the bottom 5 teams in the AL in pitching, and among the top four teams in hitting. They have had a problem lately with their starters getting out of the first or second inning without getting bombed. Plus, as 700hitter points out, their bullpen has blown 11 saves already, vs 16 the whole of last season--including the September collapse.
Oddly enough, the Phillies have the same situation. The media incorrectedly attributes the Phillies poor start to a lack of hitting: the Phillies are among the top 5 teams in hitting in the NL, but among the bottom 5 teams in pitching. It's the pitching that's killing them--mainly due to Halladay going down and Lee's poor start.
The main difference right now between the Red Sox and the Yankees is pitching. The Yankees are giving up about .5 runs per game less than the Red Sox , while the Red Sox' team BA is about 7 points higher than the Yankees.
It's about the pitching.