Zack Greinke smiled wider each time he looked at the scoreboard at AT&T Park. Four runs of support in the first inning, four more in the second and another four-spot in the sixth - highlighted by Greinke's first home run of the season. Greinke (15-8) pitched six scoreless innings and hit his fourth career home run, and the Los Angeles Dodgers romped past the San Francisco Giants 17-0 on Saturday night to build on their lead in the NL West. ''Their lineup's been about as good as it gets in the past couple of months,'' Greinke said of the Giants.