The Kansas City Royals blow an early 6 – 0 lead and drop their 13th straight game with a 13 – 8 loss to the Detroit Tigers. The skid is the second-longest ever for the Royals, who lost 19 straight the previous season and are a major league-worst 10-35.

On May 25, 2006 — The Kansas City Royals blow an early 6 – 0 lead and drop their 13th straight game with a 13 – 8 loss to the Detroit Tigers. The skid is the second-longest ever for the Royals, who lost 19 straight the previous season and are a major league-worst 10-35.

Source:
Baseball Reference May 25