Arrieta gave up four hits and one walk while striking out eight in seven innings to win his 19th consecutive decision as the Chicago Cubs beat San Francisco 8-1 Friday night, snapping the Giants' eight-game winning streak. ''It was a battle for me,'' said Arrieta, who leads the majors with a 1.29 ERA. The Cubs have won Arrieta's last 22 starts going back to last season, with their ace going 19-0 in that stretch.