The Best Reliever You’ve Never Heard Of

If you want to play a game you probably won’t win, watch a reliever you haven’t heard of pitch one inning and try to decide if they’re good. I don’t want to say it’s impossible, because that’s not quite the case, but it’s phenomenally difficult. Do they throw hard? Probably, because most relievers do now. Do they have a secondary pitch that makes hitters look like they’re playing baseball for the first time? Probably, because trying to hit a slider when you just saw a fastball is one of the hardest things to do in sports.
The eye test isn’t enough. What’s worse, the results test isn’t enough. Reliever ERAs are unreliable across whole seasons, never mind a single week or month. One seeing-eye single, or one down-the-middle cookie that gets fouled back instead of pummeled to Kalamazoo, can completely change a pitching line. Even more “stable” statistics bounce around wildly in small samples; whether a reliever has their good slider working or not might be the difference between a three-strikeout outing or a few walks and a trip to the showers.
Why the long windup about how we can’t know how good pitchers are? Well, I’m pretty sure Guardians reliever Trevor Stephan is good, whatever the sample size. I know what I just said… but, look at his pitches, will you?
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