 The quirks of the Hubert H. Humphrey Metrodome, including the turf floor and the white roof, gave the Twins a significant home-field advantage that played into their winning the World Series in both 1987 and 1991, at least in the opinion of their opponents, as the Twins went 12–1 in postseason home games during those two seasons.These were the first two World Series in professional baseball history in which a team won the championship by winning all four home games.