Fresno Grizzlies
Decker began his coaching career as a hitting coach for the Salem-Keizer Volcanoes in 2001–02 and the Fresno Grizzlies in 2003–04. He then managed for Salem-Keizer (2005–07), the San Jose Giants (2008), the Connecticut Defenders (2009), and the Fresno Grizzlies (2010–11).