Being a huge "fitba" (soccer) fan, I have to add that the word derby (pr: DAR-bee) is used in the UK to describe a match held between two local or regional teams. These games are usually very spirited both on and off the pitch, and are the source of great anticipation as they afford the winning team's supporters local bragging rights until the next match. The US equivalent would be the storied "Subway Series" held between NYC baseball teams.