Spawn vs Violator is the first fight that appears in the comic but happens between Grim Tales: From Down Below and What About Mimi.
While the siblings Grim Jr. and Minimandy are in Realm of Malebolgia picking Necropollins the Violator finds them stating he plans to "play" with them. Spawn soon intervenes and the demon ignoring his orders to stand down the two begin to battle.
Very little of the Battle is actually seen, though according to Grim Junior it is very entertaining.
Spawn eventually kills the Violator but unfortunately the Violator's brothers Vindicator, Vaporizer, Vacillator and Vandalizer confront the trio intending to avenge him. Junior transforms into his Nergaling form and dispatches the demons.