We’ve known for some time that Bradley Zimmer is unusually tall. We’ve also known for some time that Zimmer can move, and more recently we’ve found out that he’s one of the fastest sprinters in the game. When Zimmer gets himself to full speed, he’s practically the same as Billy Hamilton, and while that doesn’t say anything about the time required to get to full speed, it’s still a little surprising. Zimmer can rightfully be considered extreme, in terms of his running skill.

He’s got another one of those! Another extreme skill, I mean. Perhaps it’s not *as* extreme, but it’s close enough. We here at FanGraphs have measures of outfielder arm value. There’s arm value according to Defensive Runs Saved, and there’s arm value according to Ultimate Zone Rating. I don’t know which is better or worse, so I went ahead and combined the two. After adding and dividing, here are this year’s top 10 most valuable outfield arms:

Zimmer is in second place. What’s more, look at the innings column. Zimmer has played a good deal less than all these guys. Still, his value is where it is. As you probably understand, arm value can be a noisy statistic, and things like assists can sometimes be fluky. So it goes. To paint a more detailed picture, here’s a selection of this year’s center fielders, plotted by assists — as a rate metric — and the rate with which they’ve held would-be advancing baserunners. The held% statistic comes from Baseball Reference, and Zimmer is the point in yellow.

Zimmer has held an above-average rate of runners. More importantly, he already has seven assists. He’s one off the league lead in that department, despite the playing-time deficiency. The other extreme point here, for what it’s worth, belongs to Leury Garcia. He also has seven assists. He’s done well, but this is a Bradley Zimmer post.

By the results, Zimmer looks good. He also looks good if you dig in a little deeper. Eric Longenhagen put a 60 on Zimmer’s arm, and there’s also this relatively recent highlight clip:

Now, last season, according to Statcast, Aaron Hicks uncorked a throw four miles per hour faster than that one. Aaron Hicks has a crazy arm. Zimmer presumably doesn’t have the strongest arm in the league, but now we know it’s at least among them. As you can see in the highlight, that was 2017’s fastest throw for an assist. Zimmer has a strong arm, and so far it’s been sufficiently accurate. That leads to both held baserunners, and dead ones.

Incidentally, in the same game in which Zimmer made the above assist, he made another assist, with another strong throw. Previously, Bryce Harper had recorded the fastest outfield assist in 2017. Zimmer knocked that down to third place in one day. The arm is for real, is the point, fluky statistic or no. In the long run, Zimmer’s arm is likely to be an asset.

Brandon Guyer recently gave Zimmer a Kevin Kiermaier comp. Guyer has played with them both. Comparisons don’t get much more flattering. Zimmer will continue to work on his offense, and he’s going to have his bad games and his better ones. As a defender, Zimmer has near-league-leading speed, with near-league-leading arm strength. That takes care of two of the five tools.