I think 'clutch' exists, but rarely does it show in stats (stats w/ RISP vs Non RISP situations, etc) because those players that are clutch (ie, can handle pressure) don't falter under pressure, but that doesn't mean they perform BETTER under pressure. I think that's the key. I think some players might be more focused in important situations (down, RISP, etc vs 2 out no one on early in a scoreless game), but I think that evens out. So yes, it really just boils down to the better players come through because they are better players who have managed pressure situations throughout their career, or they wouldn't be where they are. Especially for baseball. I feel like "clutch" exists as a measurable quantity more in some other sports (you can't deny Tom Brady is just fu*cking clutch), but baseball by it's nature is just tough.