Justin Turner homered twice and Matt Kemp had a two-run shot in a testy first inning, helping the Los Angeles Dodgers beat the second-place San Francisco Giants 4-2 to stretch their NL West lead to 4 1/2 games Tuesday night.San Francisco Giants starting pitcher Madison Bumgarner hits a two-run home run during the third inning of a baseball game against the Los Angeles Dodgers Tuesday, Sept. 23, 2014, in Los Angeles.San Francisco Giants starting pitcher Madison Bumgarner throws against the Los Angeles Dodgers during the first inning of a baseball game Tuesday, Sept. 23, 2014, in Los Angeles.Los Angeles Dodgers starting pitcher Zack Greinke throws against the San Francisco Giants during the first inning of a baseball game Tuesday, Sept. 23, 2014, in Los Angeles.Los Angeles Dodgers' Yasiel Puig, right, is restrained by home plate umpire Adrian Johnson, center, and teammate Matt Kemp as he charges toward San Francisco Giants starting pitcher Madison Bumgarner after he was hit by a pitch during the first inning of a baseball game Tuesday, Sept. 23, 2014, in Los Angeles.