Answered April 18th, 2019

Nolan Ryan strikes out 19 batters in a game for the second time in 8 days and the third time in the 1974 season, but loses the game in an 11-inning 1-0 pitcher's duel.

What are the most K in a game by Nolan Ryan
Interpreted as:
What are the most K in a regular season game by Nolan Ryan?