Khris Davis has elements of being a very good player. No matter what his reputation might be, he’s perfectly good at tracking down fly balls. He runs fairly well, all things considered, and he’s swinging at a career-low rate of pitches out of the zone. What’s most important, as you already know, is that Davis has power. Major power, big-time power, the kind of power that plays in any park. Davis swats a bunch of home runs. He does so while rarely popping up. He has a career wRC+ of 122, which ties him with Carlos Santana and Yoenis Cespedes.

The A’s are happy to have Davis. Any lineup would be happy to have Davis in it. There’s just — look, it’s not like I take extra pleasure in this. I’ve got nothing against Khris Davis. I just feel obligated to point out some numbers. A short while ago, I wrote about Bradley Zimmer’s outstanding throwing arm. It’s no secret that Davis doesn’t have an outstanding throwing arm, himself. It’s a known weakness, but this year has still been exceptional. In the Zimmer post, I combined DRS and UZR arm-value measures into one. I showed you the current top-10 arms. Here are the current bottom-10 arms.

Just as in the Zimmer post, here’s how 2017 left fielders have done defensively, in terms of holding baserunners, and throwing them out. Davis is the point in yellow.

Davis has recorded one assist. There are 40 left fielders with more than that. And when Davis has had a chance, he’s prevented a baserunner from advancing 52% of the time. The league average for left fielders is a hair over 63%. Obviously, when the surface numbers are bad, the underlying numbers must also be bad. These are bad numbers.

Davis is already at -8.5 runs. That’s the number from the earlier table, and while all these arm-value numbers are estimates, they’re the best we’ve got. That’s the third-worst arm-value rating since 2003, which is as far back as we have both DRS and UZR available. And I’m writing this on July 24. The two players with worse outfield arm seasons played nearly twice as many innings in the outfield as Davis has to date. And their arm values were worse by tenths of one run. To put everything on a consistent scale, why not establish a denominator of 1000 innings?

That’s what I’ve done. I looked at every player-season since 2003 in which someone played at least 500 innings in the outfield. I calculated UZR arm per 1000 innings, and I calculated DRS arm per 1000 innings. I figured I should show them both, since they’re somewhat different. Davis, one more time, is shown here, highlighted.

By UZR arm, no one’s been worse. By DRS arm, no one’s been worse. Combine the two, and 2017 Khris Davis is at -13.3 arm runs per 1000 innings. That would be easily the worst in the sample, with the second-worst season belonging to 2013 Juan Pierre, at -9.7. Davis is taking this and running away with it.

Because the season hasn’t finished, Davis could recover. His arm could play better from here on out. But that’s likely to require some luck, since the arm isn’t good on its own. Davis seems to be having the worst arm season on recent record. It’s usually not the kind of thing you worry about, but in this particular case, it’s been costing the A’s actual runs. I don’t know what you do about it, given that Davis appears too good at running down flies to be a DH. This is just a part of the Oakland reality.

The one assist to 2017 Davis’ name? Jose Ramirez was the victim.

Ramirez lost track of the ball, and froze. Davis identified what was happening, and hit his cutoff. In one sense, it was a gimme assist. In another, was it, really?

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.

Daily notes on prospects from lead prospect analyst Eric Longenhagen. Read previous installments here.

Dawel Lugo, 3B, Detroit (Profile)
Level: Double-A   Age: 22   Org Rank: 9   Top 100: NR
Line: 2-for-5, 2 HR

Notes
It isn’t always pretty, but Lugo finds all sorts of ways to get the bat on the ball and hit it to all fields. His aggressive approach produces game power beneath what he shows in batting practice, but Lugo manages to put the ball in play consistently. Not all scouts like him at third base, citing lack of range, but he has the arm for it and his hands are okay. It’s certainly a corner profile, defensively, and seemingly one without prototypical game power, but Lugo certainly looks like he’s going to hit. He at least has the makings of a high-end platoon or bat-first utility man.

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