The Royals establish the longest losing streak by any big league franchise to play in Kansas City. Their 16th consecutive loss, an 11 – 3 decision to the Mariners, is one more than the 1884 Unions, the first team to play professionally in the “City of Fountains.”

This Day In Baseball

On July 15, 2005 The Royals establish the longest losing streak by any big league franchise to play in Kansas City. Their 16th consecutive loss, an 11 – 3 decision to the Mariners, is one more than the 1884 Unions, the first team to play professionally in the “City of Fountains.”

Source
Baseball Reference July 15