[2] His father, W. N. Walker, was an undertaker and a member of the local county high school board of education.

[2] He attended Jonesboro High School aka Academy Hill right outside of Limestone, TN where he played baseball and graduated in 1908.

He then pitched and played right field for the baseball team at Washington College in Limestone in the 1908–09 and 1909–10 school years.

[6] Hitting for a .390 batting average with Spartanburg in 35 games in 1911, Walker caught the attention of the Washington Senators.

[1] The Senators started that season poorly, so manager Clark Griffith sold his contract to the minor-league Kansas City Blues in an attempt to overhaul his team.

Owing to telegraphy experience from a boyhood job, Walker heard the Morse Code and realized that the telegram was requesting waivers on him.

[9] Walker was seen as a good hitter and he had a strong arm, having led the league's outfielders in assists for the two previous seasons.

[10] Walker earned one of his lowest batting averages (.266) that year, but Boston won the 1916 World Series.

Before the 1918 season, Walker was sent to the Philadelphia Athletics as the player to be named later in a multiplayer trade for first baseman Stuffy McInnis.

[13] Walker passed 100 career home runs that year, becoming one of the first five major league players to reach that milestone.

[14] After the 1922 season, Athletics manager Connie Mack opted to prioritize pitching and defense over hitting, so he moved the fences 30 to 40 feet deeper in Philadelphia.

[6] Walker spent six years with the Minneapolis Millers, Baltimore Orioles, Toronto Maple Leafs and Greenville Spinners.