With so many new and predictive statistics available to people that follow baseball, we sometimes forget to look at some of our old staples. Often times, this is with good reason. Things like xwOBA, batted ball data and wRC+ are more predictive than counting stats of yesteryear.
But one old school stat that we shouldn’t overlook is platoon splits. If a player is performing significantly different than their career norm against pitching of a certain handedness, this could suggest a regression (either positively or negatively) is coming.
Platoon splits are not an exact science. Just because a player has posted a wRC+ of 140 against left-handed pitching doesn’t necessarily mean their true talent level is 40 percent better than league average. And as many have noted in far more thoughtful and extensive work, they also take more time to normalize than we typically think. It’s possible that the trends I’m observing aren’t quite as relevant as they appear. However, the hitters listed below have significantly under performed their career norms to one degree or another and could see a bump in their production if it does revert to their typical level of performance. Read the rest of this entry »