There were a few different reasons people believed the LA Angels reliever wound up having a bad season. Most of the Angels’ relievers were overworked which led to poorer numbers. Some just believed he wasn’t good enough. Some blamed his velocity dip.
However, while some of that may be included in Anderson’s disappointing sophomore season, none are the end-all be-all for the reasoning. The key to Justin Anderson rebounding in 2020 and being a key part of the Angels’ bullpen is in his slider.
In his first season, Anderson’s slider was an elite pitch to get batters to swing and miss.