<P> The most successful postseason team in MLB history is the New York Yankees , who have achieved three of the four instances of a franchise winning more than two World Series championships in a row ( one streak each of durations 3 , 4 , and 5 seasons ) and five of the six instances of a franchise winning the league pennant ( i.e. , an appearance in the World Series ) more than three times in a row ( three streaks of 4 seasons and two streaks of 5 seasons ) . The only other franchises to achieve these milestones are the Oakland Athletics , who won three consecutive championships from 1972 to 1974 , and the New York Giants , who won four consecutive pennants from 1921 to 1924 . The Yankees also achieved a remarkable run of appearing in 15 of the 18 World Series from 1947 to 1964 . </P>
<P> The most successful postseason team in MLB history is the New York Yankees , who have achieved three of the four instances of a franchise winning more than two World Series championships in a row ( one streak each of durations 3 , 4 , and 5 seasons ) and five of the six instances of a franchise winning the league pennant ( i.e. , an appearance in the World Series ) more than three times in a row ( three streaks of 4 seasons and two streaks of 5 seasons ) . The only other franchises to achieve these milestones are the Oakland Athletics , who won three consecutive championships from 1972 to 1974 , and the New York Giants , who won four consecutive pennants from 1921 to 1924 . The Yankees also achieved a remarkable run of appearing in 15 of the 18 World Series from 1947 to 1964 . </P>
who has won the world series two years in a row
who has won the world series two years in a row
New York Yankees Oakland Athletics
New York Yankees Oakland Athletics