Andrew Luck, the No. 1 overall draft pick, threw his first NFL pass for a long touchdown, just like Peyton Manning in 1998, then led Indianapolis to two more touchdowns. Luck one-upped his predecessor by winning Sunday's preseason opener 38-3 over St. Louis -- Indy's first preseason-opening win since 1994.Luck might have the toughest job in football this season -- replacing Manning, the