Aceves wasn’t on the mound at the time of the incident, but raced onto the field with most of his teammates after Canada's Rene Tosoni was hit by a pitch from Arnold Leon. Aceves was among four Mexican players thrown out -- the angry Boston reliever was tossed to the ground by Philadelphia minor league outfielder Tyson Gillies during the height of the altercation.
He also appeared to take several blows to the head while being held by Canadian players. Later, he was held back by Canada coach Larry Walker.
"I had a hold of him, and I thought I saw Satan in his eyes," Walker told reporters after the game.
It turned into a wild scene, as chaotic as any on a major league field in recent years.
Even when the fisticuffs ended, a full water bottle thrown from the crowd struck the face of a Canadian coach. Canada shortstop Cale Iorg angrily threw the bottle back into the crowd.
Several police officers came onto the field trying to restore order, and there were a few skirmishes in the seats. Seven players were ejected in all.
A statement from WBC organizers said tape of the incident would be reviewed for possible disciplinary action.
Information from the Associated Press was used in this report.