How metrics put Fowler in position to save no-hitter

It’s possible that more has been made of defensive positioning over the last five years than the prior hundred before it. Infield shifts are something we actually track now, and if the early season is any indication, the usage of those infield shifts are on the climb for a fifth consecutive season. Players and managers discuss them openly, television broadcasts take note — some going so far as to display the position of every fielder on the screen — and we see the benefits (and occasional drawbacks) of the shift on a daily basis.

But nearly all the attention we’ve paid to defensive positioning has gone to the infield. There’re more holes in the infield, less margin for error when the shift doesn’t work, and baseball is slow enough to adapt to any sort of change that it should come as no surprise we had to take this one step at a time. But now, slowly but surely, teams have begun shifting more in the outfield, and before long, the outfield shift, just like the infield shift, will become accepted as standard practice, rather than something that demands attention when it happens.

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But shifts aren’t confined to lateral movement, the way we most often see. Players are free to move in and out, too, and thanks to new Statcast™ data, this is the kind of thing we’re starting to see measured and quantified.

Enter Dexter Fowler. Fowler was the center fielder behind Jake Arrieta for Arrieta’s no-hitter on Thursday night. Fowler’s been arguably the best player in baseball this year, owing to positive marks in the batter’s box, on the bases and in the field. Fowler’s long been an above-average hitter, and he’s long been a plus baserunner, but the defensive marks haven’t been so kind. You could make the case the defensive marks are the thing that’s prevented Fowler’s reputation from exceeding “nice little player” to “borderline star.” An above-average hitter who runs the bases well with a reputation as a plus center fielder is a borderline star. But Fowler hasn’t had the reputation as a plus center fielder, because the tools we use to evaluate defense in this day and age have considered Fowler one of the worst defensive outfielders in baseball since he entered the league.

Since 2009, Fowler’s first full season, 28 players have registered at least 3,000 innings in center field — the kind of sample size we prefer to have before working with defensive metrics. To contextualize Fowler’s place among his defensive peers, I took that pool of 28, weighted Defensive Runs Saved and Ultimate Zone Rating equally, and prorated the figures to roughly a year’s worth …

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