On August 11, 2003 — The Royals beat the Yankees‚ 12 – 9‚ as the teams set an American League record by stroking 19 doubles. Kansas City strokes 11 of the two-baggers‚ just one shy of the AL mark.

Source:
Baseball Reference August 11
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game