Has an NPB (Japan) game ever ended 14-4?
Yes. NPB (Japan) has seen a final score of 14-4 45 times. It first happened on July 9, 1950, when Chunichi Dragons beat Osaka Tigers, and most recently on August 12, 2024, when Fukuoka Softbank Hawks beat Tohoku Rakuten Golden Eagles.
That makes 14-4 the 93rd most common final score out of 223 that have ever occurred in NPB (Japan). One point away, 15-4 has happened 33 times and 14-5 has happened 51 times.