Check out these stats covering the period June 26, 2009 through July 28, 2009:
Johnny Damon: 102 PA and a BA/OBA/SLG of .221/.343/.395
Melky Cabrera: 92 PA and a BA/OBA/SLG of .288/.370/.400
Nick Swisher: 92 PA and a BA/OBA/SLG of .240/.359/.413
As a team, during this period, the Yankees had an overall SLG mark of .482 (in 1,100 PA). And, New York went 21-7. Hey, thank goodness for that slugging infield and DH, right?