James Ross Walker
- Bats Left, Throws Left
- Height 6' 2", Weight 190 lb.
- School Austin Peay State University
- Debut April 2, 1997
- Final Game June 2, 2009
- Born July 1, 1971 in McMinnville, TN USA
Jamie Walker has a son, James Leyland Walker, but James is not named after Jim Leyland. He is named after Jamie's father James and his wife's grandfather, Leyland Estes.
A workhorse reliever, Walker led the 2007 AL in pitching appearances. Showing that not all players make the huge bucks, Walker did not earn over $1 million in a season until 2006, his seventh major league season (he had pitched in at least 50 major league games in five of the previous seasons).
- AL Games Pitched Leader (2007)