The scheduler runs at 5:30 AM BDB time (AKA EST, AKA GMT -5). When the scheduler runs it does the following in order:

  1. Schedules world champs
  2. Schedules regional champs
  3. Schedules regional fights
  4. Schedules inter-regional (AKA World) fights
It's important to note that when the scheduler runs it will only pit fighters who are within 1 rating point against each other. Also the scheduler orders fights by the manager's level of success in the game, i.e. fighters from a new gym are more likely to face other fighters from a new gym rather than fighters managed by a veteran. When picking opponents for existing regional champs the scheduler intentionally tries to give title opportunities to lower rated managers.