I wonder if we might get somewhere more profitable if we redefined terms. I think clutchiness is too slippery and something evaluators of talent wouldn't know how to identify within the player, but rather clutchiness is created out of specific conditions, conditions so rare that any data set seems untrustiworthy. But with that said, I can completely relate to the notion that what we know about the human condition suggests that there's certainly an element of grace under pressure in all human activities--we can all admit that such notions are abstract and ultimately judged just as abstractly with our intuition rather than our rationale. What I'm wondering precisely, is that rather than argue over the existence of clutchiness, we find common ground, in another abstract concept but one that I believe scouts actually look for. Poise. I think we can agree the concept is easily associated with pitchers. An old Baseball Think Factory article*, lists it among attributes that a pitcher is judged by (including some other slippery concepts like baseball instinct and aggressiveness). I think there's a hitter's counterpart for such a concept that everyone can admit probably affects how a hitter performs. In any case, such attributes are going to be mutable and dictated by conditions larger than the in-the-game situation. While sample size and quantification problems prohibit anyone from "proving" or "establishing" abstract characteristics like poise and clutchiness, I think it's just as silly to assert that such qualities don't exist (or don't affect baseball outcomes) because of they are irreducible and unfungible. *http://www.baseballthinkfactory.org/primate_studies/discussion/mckarmey_2003-07-28_0/ " Pitchers are graded for fastball velocity, fastball movement, control, curveball, slider, change of pace, "other" pitch, mechanics, poise, baseball instinct, and aggressiveness"