Yankees Retire #23 Uniform On this day, in 1997 Don Mattingly is the first Yankee to have his number retired without winning a Championship, his uniform number 23 was retired and his plaque was dedicated in Monument Park at Yankee Stadium. August 31, 1997 Sport: Baseball Trivia What Are the Five Events That Make Up the Modern Olympic Pentathon? Which Nations Won the Gold, Silver and Bronze Medals the Last Time Baseball Was an Olympic Sport? sports in this article Baseball tags in this article Fan On This Day SportsEngine