Kranitz served as a player-coach with the Pikeville Cubs in 1984 and the Winston-Salem Spirits in 1985, though he pitched a total of three innings in those seasons. He served as a minor league pitching coach, Minor League Pitching Coordinator and an assistant coach for the Cubs organization through 2001, when he was named the bullpen coach for the 2002 season. Kranitz managed the Daytona Cubs in 2003 and served as the pitching coach for the Iowa Cubs in 2004 and 2005.
Kranitz was named the pitching coach for the Florida Marlins in 2006. He was named Baseball America's 2006 Major League Coach of the Year in his first year as pitching coach for the Marlins.[2] Kranitz remained with the Marlins in 2007, but resigned shortly before the end of the season.[3]
In 2008, Kranitz became the pitching coach for the Baltimore Orioles.[4] There, he struggled to find the same success as in Florida; in 2008 and 2009 the Orioles' pitching staff posted team ERAs of 5.13 and 5.15, respectively. In 2010, although the end-of-year numbers were much more respectable, the team was doomed by a historically futile start that saw them win only 34 of their first 105 games.
On November 1, 2010, Kranitz accepted an offer from the Houston Astros to become their minor league pitching coordinator.[5][6]
On November 15, 2010, it was announced that Kranitz would be replacing Rick Peterson as pitching coach for the Milwaukee Brewers.[7] He was dismissed after the 2015 season.[8]
Kranitz became the bullpen coach for the Philadelphia Phillies in the 2016 season, and was promoted to pitching coach for the 2018 season. Kranitz was fired by the Phillies shortly after the 2018 season.[9]
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