 Traded by the Mets to the Houston Astros on September 1, 1984, for third baseman Ray Knight, Young made his major league debut with them on July 8, 1987.He showed promise by hitting .321 and stealing 26 bases for the Astros, finishing 5th in National League Rookie of the Year voting despite playing less than half a season with the major league club.Young's best season in the major leagues came the following year, 1988, when he finished 2nd in the NL with 65 steals.