As for clutchiness... In the major leagues, every player knows how to hit and that they want to hit every time they're at the plate. If they are "trying harder" in clutch situations, why can't they "try" that hard every AB? Or if you feel that it's some in-born quality, why doesn't that quality transmit to every AB? I do believe that some are better in pressure situations than others, but at the Major League level I have a hard time believing that the best players in the world a) "wilt" psychologically under the pressure (though there are rare exceptions) or b) are not the same hitters in non-RISP situations. I think some players may have slight edges in clutchiness, but you might as well just put your best hitters in the most crucial situations. It's not like Gwynn becomes better than Corey Hart in close and late situations, Gwynn may outperform himself in other situations but Hart is still the better hitter.