Everything, ultimately, has to come down to runs. Or wins, I suppose, but wins and runs are strongly correlated. By boiling measures and evaluations down to runs, we’re given an understanding of how much they matter at the end of the day. We know how to value a guy who hits a lot of home runs. We know how to value another guy who’s said to be great in the field. Runs and wins are at the core of performance analysis, because runs and wins are what teams are trying to add to get better.
When you talk about catcher pitch-framing, one generally ends up talking about the difference between a ball and a strike. It might seem like a missed call here and there shouldn’t matter — these are just individual pitches! — but each call does matter, and as they pile up, they matter more. Toward the end of last season, Joe Maddon said something to the effect of Jose Molina saving his team 50 runs or so because of his receiving. Catchers are ranked on their framing by runs saved or cost, and this is calculated by using the run-value difference between a ball and a strike. Each season, the best framers seem to be tens of runs better than the worst framers. When you’re talking about tens of runs, you’re talking about a significant effect.
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