Has a World Baseball Classic game ever ended 14-4?
Exactly once. On March 8, 2013, Italy beat Canada 14-4, and no World Baseball Classic game before or since has ended that way. When it happened it was a scorigami, the first 14-4 in league history.
That makes 14-4 the 47th most common final score out of 80 that have ever occurred in World Baseball Classic. One point away, 15-4 has happened never and 14-5 has happened never.