Never Use an ABS Challenge in This One Weird Count

If you clicked through to read this post, you’ve probably visited the ABS Challenge Leaderboard on Baseball Savant at some point this season. While you were there, you may have sorted by Won% to see which players have been the most successful with their challenges. And if you, like me, are a bit of hater, you also reverse sorted to see which players are now considered a fire hazard because of how rapidly they burn through challenges. In that case, you know that James Wood has won just 20% of his 15 challenges, that Josh Naylor owns a 25% success rate on 12 challenges, and that Jazz Chisholm Jr. has a 27% hit rate on his 15 challenges. Players this bad at picking their spots probably shouldn’t be allowed to challenge at all, right? Well the truth is, those samples probably aren’t large enough to definitively signal an inability to consistently win ABS challenges. Or maybe they are large enough, but it’s tough to say for sure because the ABS challenge system hasn’t been in place long enough to generate the volume of data needed to determine an appropriate sample size.
But even if there were absolute certainty about which players lack the eye for challenging ball/strike calls, sitting a player down and telling him he’s not allowed to challenge anymore because he sucks at it isn’t exactly the best strategy. It runs the risk of damaging the relationship between the player and the team and it shuts down the opportunity to improve with additional reps. And let’s say that player is in the box for a pitch that absolutely should be challenged — given the short window to challenge following a call, a batter paralyzed by self-doubt or concern over potential reprimand is set up to fail. It’s also much easier to communicate and get buy-in on a single, team-wide philosophy than it is to devise a bunch of player-specific exceptions to the rule.
The good news is that there’s a straightforward method for eliminating many of the most infuriating failed challenges, a method independent of any given player’s ability to judge whether a pitch was in the zone. Because there’s more to challenging than assessing whether a ball/strike call is correct and then assigning a level of certainty to that assessment. If you’ve ever watched a batter on your favorite team spend a challenge on an 0-0 count in the first inning, you know that it’s vexing on multiple levels. Even a successful challenge in that scenario doesn’t offer a significant swing in advantage, since it’s just flipping an 0-1 count to a 1-0 count (a swing in run expectancy of about a tenth of a run, depending on the base-out state). And to make things even more maddening, it also tightens the calculus around future challenges, since an additional failed challenge risks leaving the team unable to act on a potential missed call in a late-and-close situation. Read the rest of this entry »










