Who has been the most dominant pitcher in Nippon Professional Baseball history, and how would one go about answering this question?
It’s not an easy answer, since baseball careers represent multiple dimensions: performance over a career, performance within seasons and performance in individual games of greater or lesser import.
Therefore, there is no single objective answer, but I’ll give it my best shot.
While researching a story for Japan’s Slugger Magazine, I spoke to MLB scouts about the next crop of pitchers who might move to MLB, and they all referred to the difficulty in identifying a Japanese pitcher to follow in the footsteps of Yoshinobu Yamamoto.
I casually mentioned my belief that Yamamoto might have been the most dominant pitcher in the history of Japanese pro baseball without any objective evidence to back it up. In one sense, I believe I was spot on, and had his career continued in Japan, he certainly would have had a chance to turn in the greatest career in NPB history.
In 2013, I had a similar conversation with a co-worker at Kyodo News when I suggested that Masahiro Tanaka’s 2013 was the greatest pitching performance in Japanese history, better than Hall of Famer Kazuhisa Inao’s 1961 season, when the big guy went 42-14 with a 1.69 ERA in a career-high 404 innings.
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