The Midwest League came to Kane County in 1991 when the Wausau Timbers relocated to Geneva, IL. The Wausau (1975-1990) Midwest League franchise was previously based in Decatur, Illinois (1952–74). The team has been known as the Cougars since moving to Kane County. They were affiliated with the Baltimore Orioles in 1991 and 1992, with the Florida Marlins from 1993 to 2002, the Oakland Athletics from 2003 until 2010, the Kansas City Royals for the 2011 and 2012 seasons, and the Chicago Cubs for the 2013 and 2014 seasons before affiliating with the Arizona Diamondbacks in 2015.