Duel is a game mode in Destruction Derby. Duel is a two-player romp on an empty track with the objective of either finishing the course or dismantling your opponent. It is played either on a Wreckin' Racing track or a Destruction Derby bowl.
Unfortunately with Duel it is not possible to choose your CPU opponent: it will always be Trashman, a competitor who starts out right next to the human player's position in a Championship Division 5.
Duel is also one of the multiplayer Link Cable modes, allowing two players to battle each other on an empty bowl.