The Pirates recovered from a 3 -- 1 deficit to win the 1925 World Series over the Washington Senators .
The Pirates reached the 1927 World Series before being swept by the New York Yankees , who at that time had built the most dominant team in baseball .
The Pirates recovered from a 3 -- 1 deficit to win the 1925 World Series over the Washington Senators , and reached the 1927 World Series before being swept by the New York Yankees , who at that time had built the most dominant team in baseball .