To refute this, I'm saying that a player's performance does not shift whether or not there is a base runner on or not. The fact that his numbers are different with runners on is all just a matter of coincidence. A player doesn't suddenly gain better offensive ability (or worse), based on the situation at hand, i just cannot believe that theory. Wait, you actually can't believe that it's possible that there exists a player who performs either better or worse under different levels of pressure? Not just "I don't think the evidence supports it" but "I don't see how there could be a mechanism in place for this to be so" That's tremendously weird. I don't see how it could be possible that every player in baseball could be completely unaffected by differing levels of pressure, personally.