How many teams have won back-to-back World Series?

MLB is a competitive league with 30 teams that play a rigorous regular season schedule of 162 games. Reaching the World Series is quite a big feat, but there have been a few who have gone on to repeat their success. There have been 118 World Series champions, with 14 teams having had the distinction of winning two World Series in a row.

It's no surprise that the New York Yankees, who have won 27 World Series, are on the list of back-to-back championship teams. They repeated their success as early as 1927-28 and as recently as the three-peat-winning dynasty of 1998-2000. They are also the latest to win back-to-back World Series titles.

The Yankees had their best seasons in the MLB in 1927 and 1928, led by two legendary players, Babe Ruth and Lou Gehrig. They swept the Pittsburgh Pirates and the St. Louis Cardinals in both World Series. A few years down the line, after Ruth's retirement, it was Gehrig who led the team to four straight titles from 1936 to 1939.

The Bronx Bombers continued their dominance of the league as they won five straight titles from 1949-53, three of which came against a resurgent Dodgers team. This is the longest streak of success in the MLB. In later decades, the Yankees would have further success, winning back-to-back in 1962-63 and 1977-78.

The most recent occasion on which they repeated came in the late 1990s and early 2000s, when they won four championships in five years. Hall of Fame players like Derek Jeter and Mariano Rivera steamrolled opponents on their way to success, as they are still the only team in the contemporary era to win three in a row.

The Oakland A's come second on the list with the most back-to-back championship rings. Originally founded as the Philadelphia Athletics, the A's won three out of four World Series titles from 1910-1913, with the first two back-to-back. The A's would repeat their wins in 1929 and 1930, defeating the Cubs and the Cardinals. Since moving to Oakland, they have had three-peat successes between 1972-74.

Who were the first team to win the MLB World Series twice in a row?

The Chicago Cubs were the first team to achieve this feat, beating the Detroit Tigers. Boston Red Sox managed it in 1915 and 1916, the first of Babe Ruth's career before he was sent away to the Yankees. The then-New York Giants (now SF Giants) would win dual rings in the first two of the three All-New York World Series in 1921 and 1922.

The Toronto Blue Jays would win back-to-back titles in 1992 and 1993 in their only two appearances in the World Series. The Cincinnati Reds won in 1975 and 1976 in a successful decade for them.