New York Yankees 1960 1963

Arnold Johnson, owner of the Kansas City Athletics, was a longtime business associate of then-Yankees co-owners Del Webb and Dan Topping. Because of this "special relationship" with the Yankees, he traded them young players for cash and aging veterans. Invariably, these trades ended up being heavily tilted in the Yankees' favor, leading to accusations that the Athletics were little more than a Yankee farm team at the major league level. Kansas City had been home to the Yankees' top farm team for almost 20 years before the Athletics moved there from Philadelphia in 1954.
In 1960, Charles O. Finley purchased the Athletics, and put a cease to
the trades. However, before this, the Yankees strengthened their supply
of future prospects, which included a young outfielder named Roger
Maris. In 1960, Maris led the league in slugging percentage, RBIs, and
extra base hits. He finished second in home runs (one behind Mantle)
and total bases, and won a Gold Glove, which gathered him enough votes
for the American League MVP award.
The year of 1961 would prove to be one of the most memorable
in Yankee history. Throughout the summer, Mantle and Maris hit home
runs at a fast pace, and became known as the "M&M Boys".
Ultimately, a severe hip infection forced Mantle to leave the lineup
and drop out of the race. Maris continued though, and on October 1, the
last day of the season, he hit home run number 61, surpassing Babe
Ruth's single season home run record of 60. However, MLB Commissioner
Ford Frick (who, as it was discovered later, had ghostwritten for Babe
Ruth during his career) decreed that since Maris had played in a
162-game season and Ruth had only played in one with 154, two separate
records would be kept. It would be 30 years before the dual record
would be done away with, and Maris would hold the record alone until
Mark McGwire broke it in 1998. Maris still holds the American League
record.
The Yankees won the pennant with a 109–53 record and went on to defeat
the Cincinnati Reds in the 1961 World Series. The team finished the
year with a then record 240 home runs. In 1962, the sports scene in New
York changed when the National League expanded to include a new team,
the New York Mets in nearby Flushing, Queens. The Mets lost a record
120 games while the Yankees would win the 1962 World Series, their
tenth in the past sixteen years, defeating the San Francisco Giants in
seven games.
The Yankees reached the 1963 World Series, but were swept by the Los
Angeles Dodgers. After the season, Yogi Berra, who had just retired
from playing, took over managerial duties. The aging Yankees returned
the next year for a fifth straight World Series, but were beaten in
seven games by the St. Louis Cardinals.