Police tell KNTV the victim was in a crowd of Dodgers fans when the fight started shortly after 11:30 p.m. (PST) Wednesday at Third and Harrison streets near the ballpark.
Three people have been detained. Police have not released additional details.
The violence comes just three days after a teenage football fan was attacked at San Francisco's Candlestick Park during the San Francisco 49ers 27-7 loss to the Indianapolis Colts. Other violence broke out at the game on Sunday despite an increase in security. The stadium was also the site of two shootings, beatings and fights during a preseason game two years ago.
Stadium security and fan behavior also came under scrutiny when another Dodgers-Giants matchup saw a Northern California paramedic severely beaten. Brian Stow, a Giants fan, suffered a traumatic brain injury after a beating by two men dressed in Dodgers gear following the March 31, 2012, home opener between the teams.
When will this madness stop?