Roki Sasaki has been putting up bonkers numbers in Japan, with a 2.02 career ERA, and there's a chance he comes over to MLB this offseason.
The assumption is that teams know more about players they already had, which is why they tend to get more production from re-signing their own players.
Not only have they been playing in an entirely different league, but pitchers are also subject to more season-to-season swings in production.
Sasaki has pitched in front of pitch-tracking machines, has played at one of the highest levels in baseball outside the big leagues, giving insight into his health.
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