At Baltimore’s Maryland Park, Joe Strong of the Baltimore Black Sox beats Hilldale in an Eastern Colored League game, 2 – 1, pitching an 11-inning no-hitter. It is the longest no-hitter in Negro Leagues history.

On August 4, 1927 — At Baltimore’s Maryland Park, Joe Strong of the Baltimore Black Sox beats Hilldale in an Eastern Colored League game, 2 – 1, pitching an 11-inning no-hitter. It is the longest no-hitter in Negro Leagues history.

Source:
Baseball Reference August 4
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game