Justin Wrobleski tossed six scoreless innings to become the first Dodgers pitcher since 2009 to win his first four starts, and Los Angeles defeated the Chicago Cubs 6-0 on Sunday in the series finale. Wrobleski (4-0) allowed four hits, struck out six and walked a season-high four on a career-high 109 pitches while facing the Cubs for the first time in his career. The left-hander matched Chad Billingsley, who won his first four starts 17 years ago.