The New York Yankees Major League franchise began in 1901 as the Baltimore Orioles. In 1903 the team moved to New York and were named the Highlanders. The team name was changed to Yankees in 1913.
Mariano Rivera made his Yankees debut in 1995.
The Core FourFour current players on the New York Yankees started their careers as Yankees in 1995. You might want to exclude Andy Pettitte as he took off to Houston for three years. That narrows it down to three players. Here is a list of when each player made their Major League debut that year. I don't know who was on the opening day roster. You decide. Andy Pettitte made his Yankees debut on April 29, 1995Mariano Rivera made his Yankees debut on May 23, 1995Derek Jeter Made his Yankees debut on May 29, 1995Jorge Posada made his Yankees debut on September 4, 1995
Derek Jeter made his Major League debut with the New York Yankees on May 29, 1995.
Bernie Williams made his Major League debut on July 7, 1991 for the Yankees.
Mickey Mantle made his Major League debut with the New York Yankees on April 17, 1951.
Jorge Posada made his MLB debut on September 4, 1995 for the Yankees in a game against the Seattle Mariners at Yankee Stadium. He was a defensive replacement for Jim Leyritz in the 9th inning of the Yankees 13-3 victory.
On April 17, 1951, Mickey Mantle made his Major League debut for the New York Yankees.
Yes Nick Johnson made his major League debut with the New York Yankees on August 21, 2001. He played with the Yankees from 2001 -2003. In 2009 the Yankees signed a 1 year deal with Johnson, and he will be playing with the Yankees in 2010.
Joba Chamberlain made his Major League debut for the Yankees on August 7, 2007. Prior to that, he played for Scranton/Wilkes-Barre, the Yankees Triple-A affiliate.
On May 29, 1995, Derek Jeter made his major league debut against the Seattle Mariners in Seattle.
Hideki Matsui signed as a Free Agent with the New York Yankees in 2002, and made his Major League debut on March 31, 2003.
Joe DiMaggio Made his Major League debut with the New York Yankees on May 3, 1936.