The Spokane Indians (Texas Rangers) edge the Tri-City Dust Devils (Colorado Rockies) 2-1 in 23 innings. The Northwest League game, which lasted 6 hours, 37 minutes, was scoreless for 19 innings and suspended in a 1-1 tie in the 21st inning the previous night.

On August 18, 2004 — The Spokane Indians (Texas Rangers) edge the Tri-City Dust Devils (Colorado Rockies) 2-1 in 23 innings. The Northwest League game, which lasted 6 hours, 37 minutes, was scoreless for 19 innings and suspended in a 1-1 tie in the 21st inning the previous night.

Source:
Baseball Reference August 18
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game