He was number 29
During the 1958 World Cup Garrincha's official jersey number was 7. Though there is footage of him also wearing the number 11 in other international games for Brazil though number 7 is what he is remembered by.
Herschel Walker wore #34 during his NFL career.
Bo Jackson was an American football and baseball player. His jersey number was the number 8 when he played for the Chicago White Sox.
Melvin Mora on the Baltimore Orioles is the only one that I know of.
There were no jersey numbers when he played.
Micahael Jordan wore number 45 during his days as a baseball player.
He was number 29
The number on his jersey is 22 during high school and college. When he went pro he was number 21.
14
The most common baseball numbers are 13 25
Drew stubs
Russle Branyan on the brewers in 2008
alex rodriguez
number 10
Nick Swisher NYY
During his career with the Cowboys, Roger Staubach wore jersey number 12.