Yordan Alvarez's sixth-inning home run, against the left-handed reliever brought in exclusively to retire him, traveled 450 feet to straightaway center field, clearing the towering batter's eye, scoring three runs, sending his jubilant teammates streaming onto the field and propelling the Houston Astros to a 4-1, title-clinching victory over the Philadelphia Phillies in Game 6 of the World Series on Saturday night.