At Fenway Park, Manny Ramirez of the Boston Red Sox leads his teammates out of the dugout waving an American flag to celebrate his first day as a citizen of the United States. As the 31-year native of the Dominican Republic comes to bat, the song America by Neil Diamond is played over the public address system.

On May 11, 2004 — At Fenway Park, Manny Ramirez of the Boston Red Sox leads his teammates out of the dugout waving an American flag to celebrate his first day as a citizen of the United States. As the 31-year native of the Dominican Republic comes to bat, the song America by Neil Diamond is played over the public address system.

Source:
Baseball Reference May 11