Monument Park is about to get a lot more crowded. Over the course of the 2015 MLB season, the New York Yankees are set to retire three legendary uniform numbers. Three great former Yankees are having their numbers entered into Monument Park, and will have their numbers alongside other former Yankee Greats, including their former teammate Mariano Rivera. The three players are: - Bernie Williams - Jorge Posada - Andy Pettitte These will be the 18th, 19th, and 20th, numbers retired by the Yankees, the 17 that they already had retired was the most in baseball, and they continue to add to the list. They have retired two different numbers twice, those numbers being: 8 (Yogi Berra & Bill Dickey) and 42 (Mariano Rivera & Jackie Robinson).