Currently, Alfredo Aceves wears #91. Charlie Keller wore #99 in 1952 for the Yankees.
No player on the New York Yankees wore uniform number 11 in 1970.
Mariano Rivera Number 42Mariano Rivera is the last Major league ballplayer, and Yankees player still wearing uniform number 42. Major League Baseball retired Jackie Robinsons uniform number 42. No Other player on any team can wear the number. Because Mariano had the number when Robinsons number was retired he was allowed to continue wearing it. When Mariano Rivera retires from baseball the New York Yankees will retire uniform number 42 in honor him.
Billy Martin wore number 12 in 1950 and the number 1 from 1951-1957 as a Yankee player. Billy also wore the number 1 as the Yankees manager (1975-1979, 1983, 1985 and 1988). Billy Martin's number 1 was retired by the Yankees in 1986.
Cliff MapesCliff Mapes wore uniform number 3 for the 1948 New York Yankees, then switched to number 13 later that year when the Yankees retired number 3 for Babe Ruth. Mapes also wore uniform number 7 for the Yankees from 1949 - 1951. Later in the 1951 season Mapes was traded and Mickey Mantle took number 7.Mantle originaly wore uniform number 6 in 1951 but was sent down to the minors because of a slow start. When he returned number 7 was his for good.
Technically a player can choose up to the number 99, however high uniform numbers are rarer as many players opt to choose lower numbers.
The team colors are navy blue and white. The home uniform is white with distinctive pinstripes and a navy blue interlocking "NY" at the chest. The away uniform is gray with "NEW YORK" written across the chest. The player number is on the back of the uniform jersey, and is not accompanied by the player name. A navy blue cap with a white interlocking "NY" logo is worn with both uniforms.
No Yankees player currently wears number 40.
Currently, no player wears #21 for the Yankees.
Currently, no Yankees player wears #14.
He is the last active player to wear the uniform number that has been retired by all other teams in honor of the late Jackie Robinson. When Rivera's career ends, no other Yankees player will ever again wear it.
The number isn't being worn by anyone on the Yankees' 2010 roster.
Cody Ransom wore number 12 for the Yankees in 2009.