A pitcher’s health is inherently fragile, and small changes in velocity or stuff can lead to wild fluctuations in performance. Even if a pitcher stays off the disabled list and maintains the quality of his arsenal, outside factors such as defense, luck and where he pitches can significantly affect his results. As with the hitters, there is no perfectly scientific method for determining who is MLB’s most consistent starting pitcher. Still, with all of those obstacles in mind, here is one attempt to do just that, again evaluating the five-year span from 2013-17.