Police said the victim was in a crowd of Dodgers fans when the fight started shortly after 11:30 p.m. Wednesday at Third and Harrison streets near the ballpark. They said the victim's father and brother were both wearing Dodger colors, they were both unharmed. The victim was not wearing Dodgers colors.
Police have detained three people and are interviewing witnesses. The altercation involved a comment about Dodgers apparel. Police did not say if any of those involved were wearing Giants gear.
Police did not confirm if the fight was linked to the victim and his family being Dodger fans.
The Associated Press and KGO-TV contributed to this report.