Let’s Improve Bryce Harper’s Defense

Bryce Harper started out as a catcher. By the time he was old enough to drive, though, everyone knew his catching days were numbered. When the Nationals drafted him in 2010, they stamped that nonsense out, because no one who can mash like Bryce Harper is allowed to waste their energy and their knees behind the dish. Harper moved to the outfield, and those of us who were there in 2012 will recall that for a short while, he was fantastic out there. He played with his hair on fire, he had a rifle arm that slotted in nicely alongside Rick Ankiel’s cannon, and in those first couple years before Statcast appeared, he was downright fast. It didn’t last too long, though. Harper decided to beef up, arriving in Florida each spring with more and more muscle mass and less and less footspeed. Also, he ran into walls a lot. For most of his career, Harper was a poor outfielder, and then in 2023, he returned from Tommy John surgery as a first baseman, initially on a temporary basis. He has not played in the outfield since.

So far this season, according to Statcast’s Fielding Runs Value, Harper has been the fourth-worst fielder in baseball. He’s at -7 FRV, ahead of only Willy Adames and Logan O’Hoppe at -10, and Owen Caissie at -8. According to our defensive numbers, which include a positional adjustment, Harper has been worth -12.3 runs, making him the worst defender in baseball by a substantial margin. So that’s bad. Nobody wants to be at the very bottom of the leaderboard. I mean, I suppose once you sort the leaderboard upside down, it shouldn’t be called a leaderboard anymore. It should really be called a trailerboard. Or maybe the shame list. I’m spitballing here. The point is that’s not where Harper wants to be. And it gets worse.

Statcast has FRV values dating back to 2016. Here’s the single-season trailerboard for that entire 11-year period:

So the worst total ever recorded is -9 FRV. Harper is already at -7, and he’s still got half a season left to move beyond 1,250th place. He’s on pace for -13 FRV and -23.2 defensive runs, which would absolutely boat race the worst defensive seasons of the Statcast era. On the bright side, he’s no longer running into walls.

So is Harper one of the worst defensive first basemen in recent history? The other defensive metrics don’t think so. (As a matter of fact, they’re formulas, so they don’t think at all, but you get the point.) Harper is at -1 Defensive Runs Saved this season, an improvement over the -3 he put up in 2025. Deserved Runs Prevented, the flagship defensive metric of Baseball Prospectus, is much more conservative than the others, so Harper’s -0.3 mark makes him the fourth-worst first baseman this season. That’s very bad, but it’s not historic or anything. Last season, he was at a positive 0.3 DRP. In other words, we’re seeing a sudden drop-off according to two metrics, while the other metric thinks Harper has gotten very slightly better.

Harper also graded out fantastically at first base as recently as 2024. That was his first full season at the position, and he nailed it. He was worth 5 DRS, 5 FRV, 0.9 DRP. You can take my word for it (along with the absence of minus signs) that all of those numbers are good. Two years ago, Harper was a good first baseman and all the computers thought so. This season, one of them thinks he’s meh, one thinks he’s terrible, and one thinks he’s bordering on the worst ever to do it.

Now it’s time for the big caveat you’ve been waiting for. Defensive metrics are far from perfect, and they take a long time to stabilize. In fact, when I started writing this article yesterday, Harper was at -8 FRV. Then last night, he made a couple great plays — one of which you can watch below — and knocked it down to -7. That’s the thing about small sample sizes.

Half a season of an ugly FRV does not the worst defender ever make. Still, numbers this extreme definitely mean something, and the nice thing about Statcast is that it gets very specific. Here’s why the fancy cameras dislike Harper:

First basemen don’t really go back on the ball too much, so we can mostly ignore that last column. Charging the ball isn’t Harper’s problem either. Hit the ball right at him, and he’ll probably be just fine. The problem is on the sides. In 2024, Statcast says Harper was great going both to his right (toward second base) and to his left (toward first base). In 2025, he stopped being good to his right side. This year, he stopped being good to his left side, too. He has now officially run out of sides.

With this data in hand, I hit the tape. Here’s another big caveat: Every player is going to look bad if you’re going into your film session looking for the things they’re doing wrong. It’s just human nature. However, I did my best to look at every single ball hit Harper’s way, not just the ones that got by him. Moreover, I’m here to help. I did notice a few clear issues, and I’ve prescribed some simple fixes.

The first problem is that Harper isn’t great at diving for the ball. That’s unfortunate, because although first base isn’t the hot corner, the position is still awfully close to home plate and involves a lot of plays that don’t provide much in the way of reaction time. Harper has had a lot of plays this year where he only has time for a step and a dive. I suspect that a fielder with better instincts and a quicker first step wouldn’t have to dive quite as often, but there’s only so much I can do to quantify that. That’s what Statcast is particularly good at, because it knows every player’s starting point and how much time they have to make each play. For right now, what I noticed is that Harper rarely seems to come up with the ball when he dives for a grounder. On nearly every play in the supercut below, he is within range of the ball, but he doesn’t get his glove down in time, or he dives too late, or the ball deflects off him, or he just doesn’t get extended.

All of these clips are just from the first half of this season, so this is happening pretty regularly. I don’t really know how you fix that. Harper didn’t grow up playing the infield. He spent almost no time on the dirt until he turned 30. It might just be too late for him to develop that particular skill, and it would be lunacy to risk an injury to such a valuable hitter by making him practice hurling himself to the ground over and over again. So that part’s going to be tough. Just to make Phillies fans feel better about this one, here’s a video of Harper making a diving play:

There, that’s nice. Now, I don’t mean to say there’s nothing Harper can do to fix this problem. I don’t know how you get him better specifically at making the play once he’s diving for the ball, but I do think there are a few things he could do to avoid having to dive in the first place. I’m sure that working on his instincts and his first step is already a part of his daily infield routine, but beyond that, there are a couple of ways for him to get in a position to make a few more plays.

I would argue that Harper should play a bit deeper to buy himself more time. This season, when lefties are at the plate with no one on, the league’s first basemen have average depths ranging 120 feet and 130 feet. Harper is right in the middle at 125. When righties are up, he averages 111 feet, a bit shallower than average. If you recall the table at the top of this article, Harper has always been good, maybe even great, at coming in on the ball, so why not push him back just a couple feet? He still wouldn’t be the deepest first baseman out there, but he would get a little bit more of the reaction time that he needs.

The next issue I noticed also has a pretty simple fix. As I watched ball after ball sneak past a diving Harper, I noticed something simple. When he’s holding a runner on first base, he tends not to get back into a good fielding position. When you’re holding the runner on first, you’re all the way on the edge of the field, which drastically reduces your range, since all of the area to your left is foul territory. Once the pitcher commits to home, first basemen usually shuffle toward their right in order to get back into a more useful fielding position. Harper is not great at that. In fact, he sometimes seems to forget to do it altogether.

According to the Statcast data, Harper actually grades out in the middle of the pack in terms of positioning when there’s a runner on first. His average angle is 41 degrees, and some players are as high as 43 (standing directly on the foul line would be a 45 degree angle). However, that data gets measured when the pitcher releases the ball, not when it crosses the plate, and at that point, most first basemen would only be a step or two into their shuffle. Harper often doesn’t seem to shuffle at all, and ball after ball leaks by his right side, even balls that are within the cutout of the infield grass. Believe me when I tell you that the video above could have been longer. At a certain point, I stopped pulling videos, because there were just too many, so here’s a sample of screenshots that show just how close he is to the bag:

He’s flat-footed in all of these shots. No wonder the numbers say that he doesn’t have good range going to his right. He’s starting as far to the left as it’s possible to get, and he doesn’t seem particularly interested in correcting that. Again, the Statcast numbers say that Harper is not the most egregious offender on this particular count, but he is a player whose range could really use some help, and making sure he remembers to take a shuffle or two in order to get into a better position seems like it would be pretty easy.

The last issue I noticed specifically about balls to Harper’s right is that he has a tendency to get greedy. You can’t run into that many walls as a first baseman, but you can go steal grounders away from your second baseman. I love that Harper is aggressive. You want your first baseman to go get the ball. And sometimes, like on these plays, it works out just fine.

Those ended up as outs. That’s great. But we all saw the second baseman behind Harper, ready to field the ball, right? Sometimes it doesn’t work out that great.

The good news is that this should be at least somewhat fixable. I’m sure every infield coach has a drill where they hit tweeners toward their first basemen in order to help them practice making the split-second decision to go after the ball or cover the bag. Let’s make that a regular part of Harper’s pregame warmups.

I have one last complaint. I think Harper is genuinely great at starting the 3-6-1 double play and the 3-6 double play where the first baseman steps on the bag and the shortstop tags the lead runner. His turns are smooth and his throws are strong and accurate. That’s why Statcast thinks he’s great coming in on the ball. Those are often balls where he has to charge and make a good throw, and he’s excellent at it. However, I think Harper doesn’t charge the ball hard enough, specifically on routine plays. He’s often happy to wait back even on softly hit balls, which means that he won’t have time to step on first base himself, which means his pitcher has to cover and catch a flip. Now, Harper’s good at making that flip, but you’d still much rather have your first baseman make that play himself. A lot of things can go wrong on those flips plays: errors, sprained ankles, collisions. Here’s a glaring example:

This ball was an easy grounder hit at 49 mph, but Harper still chose to wait back and field it 15 feet behind the bag. Even then, he still had plenty of time to make the play himself. The runner wasn’t even halfway to first when he flipped the ball to the pitcher. This was a low stakes play, and about as easy a flip play as you’ll see, but it was also a play that did not necessitate a flip at all. Harper just decided early on that he was going to flip it; that’s why he didn’t charge the ball, and that’s why he didn’t keep it even after the runner gave up on the play. Here’s a higher stakes example:

This is a very easy play that Harper turned into a hard one. That’s Cy Young candidate Cristopher Sánchez on the mound. The Phillies should be protecting his ankles at all costs! Not only was Harper the closest player to first base when he fielded this ball, but also, look at where everybody else was when he fielded it.

The batter is barely out of the box. Sánchez is still on the mound, and he has to bust it over to first. Watch that clip again and look how hard he hits the bag. This is egregious. It hasn’t really come back to bite Harper just yet, but turning easy plays into hard ones is not a great habit.

So that’s my critique of Harper’s first base defense. Just a quick 2,400 words. I should once again close by noting that we’re talking about small sample sizes, and that Harper is probably not quite as bad as Statcast makes him out to be, if for no other reason than the fact that no first baseman has ever graded out as badly for a whole season as he has in the first half of this one. However, I need to bring up one more thing.

Just a few days ago, Tom Tango wrote a blog post revealing that Statcast will soon be incorporating data about how first basemen handle throws. It’s an exciting development, and I recommend reading the whole post, but we’re interested in one specific part. Naturally, Tango mentioned a couple players who stand out: “For the 2021-present (thru June 27, 2026), Matt Olson and Freddie Freeman are tied at +25 receiving outs above average. Yuli Gurriel is at +12 at half the playing time. On the flip side is Bryce Harper at -13.” Harper is the worst at this stat even though he’s only been playing first base since late 2023. As Tango was quick to mention, Harper is a converted first baseman. Because we don’t have a year-by-year breakdown, it’s entirely possible that he’s fine at this particular skill now, and that he racked up all that negative value when he was a newbie at the position. I asked a couple smart Phillies fans (though I left Michael Baumann alone because he’s on vacation) what they thought of Harper’s receiving. One said they hadn’t noticed it much one way or another, and one said they thought he’s pretty good at it. So maybe this is merely old news or nothing at all. Or maybe Statcast is about to hate Bryce Harper even more.