Imanaga’s home at Yokohama Stadium is quite small! This may have been mentioned in passing, but it’s the first I’ve seen it.
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All five of those distances are shorter than every corresponding park in MLB, with the exception of a foot or two for the right-field poles in Boston and San Francisco.
Put into context, the largest MLB park by fair territory is 121,486 sq. ft. (Colorado, followed closely by Kansas City). The smallest is 106,923 (Houston). Fenway is 107,745. Yokohama Stadium, where Imagana pitched, has 101,021 sq. ft. of fair territory, or 6.2% less than Fenway.
I don’t know if there are any environmental factors that would mitigate the offense, but that’s a very small park!