By Frank Pingue HOUSTON - The Houston Astros chased Los Angeles Dodgers starter Yu Darvish in the second inning and rolled to a 5-3 victory on Friday that gave them a 2-1 lead in the World Series. The win stretched Houston's unbeaten home record in the postseason to seven games and put them two victories away from their first World Series title since the inception of the team 55 years ago. The Astros' vaunted offense made short work of Darvish, who allowed four runs on six hits and a walk through 1-2/3 innings in a World Series debut that fell apart for the Japanese right-hander in the second inning.