Time-through-lineup splits, 2025

Let's wrap up our mid-season one-split-away theme by looking at the stats and skills posted by starting pitchers as they go through lineups during the game.

There is a clear erosion in ERA and WHIP the more times a SP goes through a lineup during a game. The same holds for their underlying skills, as BPV, K-BB%, and HR/9 also experience significant in-game deterioration.

The level of erosion in these metrics is evident in the following data from 2019 to this point in 2025:

Let's take a look at some significant BPV by time through lineup splits so far in 2025 by focusing on those guys with the widest variances. The goal of this exercise is to identify pitchers who could be an adjustment away from making significant improvement.

   BPV
Name

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