Probably Joe DiMaggio, who wore the number 5 for the New York Yankees from 1936 to 1942 and again from 1946 through 1951. Joltin' Joe spent the 1943, 1944 and 1945 season in military service during WWII.
Ty Cobb.
Lou Gehrig
Pete Rose
Derek Jeeter
nolan ryan
Chipper Jones of the Atlanta Braves.
Roberto Clemente
Joseph Paul DiMaggio, Lawrence Peter,Eddie Clarence Murray,George Herman Ruth, and Tyrus Raymond are the most famous baseball player.
George Herman "Babe" Ruth
There are a number of famous Chelsea players and deciding the most famous is subjective. The most famous current player might be Fernando Torres or Frank Lampard. Historically Gianfranco Zola is very famous.
Jackie Robinson wore #21 for the Brooklyn Dodgers for ten seasons (1947-56).
ted Williams