On August 18, 2003 — 2003 – A major brawl breaks out in a California League game between the Lancaster JetHawks and Inland Empire 66ers. In the 15th inning of the game, Josh Kranawetter hits Evel Bastida with a pitch. Bastida charges the mound and smashes Kranawetter in the back with his bat. He is charged with felony assault and suspended for the rest of the year. 16 players and a coach get three-game suspensions for the ensuing fight.

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