This Article develops a new standard for gap filling in incomplete contracts. It focuses on an important class of situations in which parties leave their agreement deliberately incomplete, with the intent to further negotiate and resolve the remaining issues. In these situations, neither the traditional no-enforcement result nor the usual gap filling approaches accord with the parties’ partial consent. Instead, the Article develops the concept of pro-defendant gap-fillers, under which each party is granted an option to enforce the transaction supplemented with terms most favorable (within reason) to the other party. A deliberately incomplete contract with pro-defendant gap fillers transforms into two complete contracts, each favorable to a ...