Gennaro: A-Rod’s postseason problem

From SABR President Vince Gennaro at Diamond Dollars on October 10, 2012:

In a recent post I discussed my analysis of the why some hitters bring their “A” game into the postseason, while others seem to take it down a notch or two. My analysis does not deal with a player’s makeup or psyche, or how they handle pressure, nor does it have anything whatsoever to do with the topic of clutch performances. I’m coming at this from a different angle, with a data-based look at how hitters perform against different strata of pitching quality. The reason this analysis may have implications for a hitters’ postseason performance is the quality of pitchers in the postseason differs (by a lot) from regular season pitching. My hypothesis is simple—hitters who have a track record against top pitchers will survive or even thrive in the postseason, while those who are systematically beaten down by top pitchers will have a tough time shining in October.

On average, hitters follow a pattern—they perform at their average level versus “average” pitching, better against “weak” pitching, and worse against “top” pitching. Using OPS as a calibration point, hitters hit about 80 to 100 points lower against the top one-third of starting pitchers and about 80 to 100 points higher against the bottom 33%, on average.  Not everyone follows the same pattern. Some are particularly effective against top pitchers and hit only marginally better against weak pitching. Others have the opposite profile—they exploit weak pitching, while being stifled by top pitching. Alex Rodriguez profiles in the latter group. Because postseason pitching tends to be comprised of more top tier pitchers, (see my previous post) we can expect players like A-Rod to produce at a lower level during the postseason.

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Originally published: October 10, 2012. Last Updated: October 10, 2012.