Altherr’s Hot Start Hides Underlying Weaknesses (and Improvements)

It is not a controversial statement to say that Aaron Altherr is headed for some regression. His BABIP (.392), HR/FB rate (35.6%),and ISO (.381) are way outside of expected norms. The good news is that he is batting .333/.434/.714, so any regression would take him from an MVP pace to just a really good baseball player. When a player goes on a hot streak, it has a tendency to cover up underlying numbers.

For Altherr, his big underlying discrepancy is his left/right split. Here are his triple slash lines vs righties and lefties:

Vs RHPs: .333/.433/.684

Vs LHPs: .333/.438/.778

It isn’t surprising that he is hitting for more power vs lefties. But, this only tells a surface story, so let’s unpack this a bit more with some different stats.

Vs RHPs: 67 PA 11.9% BB% 31.3% K% .452 BABIP

Vs LHPs: 32 PA 15.6% BB% 12.5% K% .300 BABIP Continue reading…