During his second season with Milwaukee (2004), Kieschnick opened the season as a pitcher/pinch-hitter, but due to an injury was used exclusively as a pinch hitter for a two-month period from July 3-September 3, spending part of that time on the disabled list. Kieschnick did not appear as an outfielder or as a designated hitter during 2004. Though Kieschnick's pitching effectiveness improved over his 2003 season, his hitting tailed off, as he hit only 1 home run all year (compared to 7 in 2003).