Career
He was a left-handed pitcher who appeared in 11 Major League games over two seasons, pitching in three games for the Milwaukee Braves in 1959 and eight games for the Cleveland Indians in 1962. The native of Kenosha, Wisconsin, stood 5 feet 11 inches (180 m) tall and weighed 185 pounds (84 kg). Hartman signed with his home-state Braves after graduation from Kenosha High School and began his minor league career in 1955.
He worked in three losing efforts in middle relief and was ineffective in two of them, allowing six hits, five earned runs and two bases on balls in only 12⁄3 innings pitched.
He returned to the Braves" farm system until June 24, 1962, when he was recalled from Louisville and traded to the Indians for infielder Ken Aspromonte. Two days later, he made his first Major League start against the Detroit Tigers in the second game of a twi-night doubleheader.
Hartman lasted ten innings, allowed only three hits and one earned run with seven strikeouts, but left for a pinch hitter with the game tied, 1–1. In his next start five days later against the Chicago White Sox, Hartman started well with one run allowed in four innings, but in the fifth, he faced four batters and could not record an out, as Chicago scored three earned runs.
Hartman made six more appearances as a relief pitcher for Cleveland in July 1962 before returning to the minor leagues, retiring in 1963 after nine professional seasons.
As a Major Leaguer, he allowed 20 hits and ten bases on balls, with 12 strikeouts, in 19 innings pitched.