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It was a rough day to be a White Sox supporter on Sunday ... 'cause as the MLB team got smacked by the Diamondbacks -- one of their fans got leveled during a fight in a festival pit too.
The crazy scrap happened at SeatGeek Stadium in Illinois during Summer Smash -- a three-day show headlined by Travis Scott, Playboi Carti and Chief Keef.
In video from the scene, you can see a young Sox fan in a grey Chicago jersey got into a tiff with a man in a pink shirt who had been situated on another side of a barricade.
Unclear why the guys had beef -- but just seconds into the altercation, the CWS fan was decked to the ground by a straight right hand.