Originally Posted by
nsacpi
Just a general observation about players with reverse splits. Keep in mind the overwhelming majority of hitters and pitchers have conventional splits. So when a pitcher generates reverse splits over his career he is doing this for the most part against hitters with conventional splits. In other words, Ryu has mainly faced RHH with conventional splits and LHH with conventional splits in his career. There is something specific to his way of pitching that induces LHHs with conventional splits (of which McCann, Markakis, Joyce and Inciarte would be examples) to do better against him than RHHs with conventional splits (of which Duvall, Riley and Flowers are examples).
One additional observation about his having conventional splits in 2019. He has done very well against LHHs this year. But that's over the equivalent of 42 innings. Think of how volatile reliever data are from year to year. Ryu has faced LHHs this year in the equivalent of two-thirds the sample size for a regularly used reliever in a full season. He's been helped over this small sample by lefties having a BABIP of .214 against him. This is why splits data in a single season can be misleading. With small samples you can get crazy results due to BABIP or HR/FB fluctuating wildly.