The Washington Nationals take the crown in the 115th World Series by winning both game six and game seven in Houston. The Astros won all three games in D.C. and the Nats won all four games in the Astrodome. That's the only time the visiting team has won all the games in World Series history. I'm reminded of the 1987 Series when the Minnesota Twins and the St. Louis Cardinals won all their home games and lost all their away games! The Twins had home field advantage and thus prevailed four games to three.
The Astros were a heavy favorite.