Yesterday morning, I published a post on the main site detailing Jose Altuve’s base-running woes of the past two seasons. Within that post, I noted that Altuve is a good base-stealer, citing his success rate on stolen-base attempts this season. “Among the 71 players with at least five steal attempts this year, Altuve’s success rate ranks third,” I said. The stat would’ve been cooler if I could’ve said he was first, but I couldn’t say that, because there were two Red Sox players in front of him.

Most efficient base-stealers, 2016 (min. five steal attempts)

1. Mookie Betts, 100% (11-for-11)
2. Jackie Bradley, Jr., 100% (5-for-5)
3. Jose Altuve, 95% (18-for-19)

Two Red Sox at the top! Bradley and Betts are a combined 16-for-16 on steal attempts this year. Interesting! Bradley has still never been thrown out on a steal attempt in his major-league career, about which fact I wrote in the offseason. He’s now eight successful steals away from tying the all-time record of consecutive successes to begin a career. And then Betts might just be the best all-around base-runner in the game.

So, those two have been perfect at stealing bases, but as I scrolled down the list of base stealing efficiency, something caught my eye. In 11th place is Hanley Ramirez — Hanley Ramirez! — who’s 5-for-6. Xander Bogaerts is four spots behind him, at 9-for-11. Two spots behind Bogaerts is Dustin Pedroia, 4-for-5.

It’s the whole team! But is it really the whole team? I made a new spreadsheet of team base-stealing efficiency. I think this plot is pretty fun:

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We often treat knuckleball pitchers as if they were members of some long-forgotten sect, practicing their secret ninjutsu on the rest of the league with a pitch that defies gravity and cannot be classified. That’s fine, the knuckler is the rarest pitch in baseball, and it has its iconic moments. Let’s not begrudge anyone a little fun.

But once you peal back the layers on the pitch, you start to see that each truism about the knuckler isn’t necessarily true. In fact, there are probably more ways in which the art of throwing a knuckleball is similar to the art of throwing other pitches than it is different. At least, that is, in terms of strategy and outcomes. Mechanics are obviously a different story.

Let’s unpack some of the things we might hear about knuckleballs, and then us the data and the words of R.A. Dickey and Steven Wright to guide our analysis.

Velocity doesn’t matter.

Maybe this isn’t a thing that’s said a ton, but nobody breathlessly reports knuckleball velocity readings the way they do fastball readings, so at least implicitly we’ve decided that speed doesn’t matter as much with the floating butterfly.

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Everything Xander Bogaerts did well in his breakout season last year, he seems to be doing better this year. More power, more patience, more contact, and better defense — he’s basically equaled last year’s full-season WAR figure already, and there’s three-fifths of a season left to go. He’s leading the league right now!

Of course, WAR isn’t your traditional counting stat: Bogaerts could hypothetically put up negative wins going forward, were he to regress in one way or all of them. But since he gave us such a great preview last year, it’s tempting to believe in all of the improvements he’s made. He’s really the same guy, just a little better.

At the center of his improvement has been how hard he hits the ball, the angles (both vertical and horizontal) of those batted balls, and his defensive range. He didn’t think much had changed about those particilar variables when I asked him, though. Just a few minor tweaks.

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Back in July of 2013, I put together a little bit of research to put Michael Cuddyer’s 27-game hitting streak into perspective. I had been quite critical of Mr. Cuddyer at that time, and it only seemed fair to show him a little love. At the time, I mentioned that I might look into some more hitting streak data in the near future. Turns out the “near future” was three years later. Spurred on by the recent hitting streaks from the killer B’s on a swarm — Jackie Bradley Jr. and Xander Bogaerts — I thought I’d wade back in.

First, as I mentioned last time, a couple of ground rules. I don’t count streaks that span two seasons. I don’t like doing it, and you can’t make me. Second, there are some streaks that took place from the time before we have game logs. When I first conducted this research, the earliest season for which we had game logs was 1916; now it’s 1913. Fortunately, for the sake of convenience, no relevant hitting streaks occurred during 1913-1915, so we’re not getting any new information in that respect.

We are getting some other new information, though. For instance, Baseball-Reference has WPA calculated further back than they did before, so where before we didn’t know the WPA of Joe DiMaggio’s 56-game hit streak, now we do have that figure. We also have a few more years of streaks in the mix. The cut-off for WPA data now seems to be 1930, though there was one streak from 1943 for which WPA information appears unavailable.

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Last night, in Baltimore, Mookie Betts did this.

Those three home runs pushed his season total to 12, putting him in a tie with guys like Mike Trout, Miguel Cabrera, Giancarlo Stanton, and George Springer, among others, and ahead of a group that includes Jose Bautista, J.D. Martinez, and Miguel Sano. Through the first two months of the season, Betts is hitting for the kind of power you expect from a slugging cleanup hitter, not a diminutive leadoff guy. And while Betts hasn’t had any three-homer nights before, this power surge isn’t that new.

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How do you know when a knuckleball pitcher is good? It’s not an easy question to answer. We know it’s not just a matter of having a knuckleball — there have been bad knuckleball pitchers. But the pitches themselves aren’t easy to scout, and the whole idea behind an effective knuckleball is sort of the lack of consistency. There’s not a large sample of these pitchers to examine, which further complicates things. A knuckleballer is the most unusual player type in the game, someone who can be almost impossible to trust, but someone who also throws a pitch that seems almost impossible to hit.

There’s a line somewhere. There has to be. There’s a line beyond which a knuckleball pitcher is legitimately good, and maybe that’s when he throws 60 good knuckleballs out of 100, or maybe it’s when he throws 90 good knuckleballs out of 100. We’ve seen R.A. Dickey be an ineffective knuckleballer, and we’ve seen him be an effective one. The pitch gave his career a second chance, which is one of its magical aspects. At some point, I suppose, you just have to look at the numbers. The numbers will tell you when a knuckleballer is working. I don’t know of any other approach, and what the numbers are indicating is that Steven Wright has mastered the weirdest pitch in the sport.

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For a while there, it seemed like the healthy version of Troy Tulowitzki was the best shortstop in baseball. That’s the guy the Blue Jays wanted to trade for, but Tulowitzki has entered a decline period, vacating the positional throne. And now things are kind of complicated. It doesn’t actually matter in any real way who you rank No. 1, among shortstops, but there’s plenty of competition. Last summer, I wondered aloud if Carlos Correa was already deserving of the label. More recently, August suggested it could be Francisco Lindor. There’s probably an argument for Brandon Crawford. There’s definitely an argument for Manny Machado, if you consider him a shortstop. Young shortstop talent is seemingly everywhere, but in Boston, now Xander Bogaerts is making his case. He’s doing so by blending all of his skills.

For Bogaerts, in one way, it hasn’t been smooth. That dreadful slump in 2014 raised several legitimate questions about his future. In another way, this was how it was always going to go. Rookie Bogaerts showed some skills. Sophomore Bogaerts showed different skills. Now the skillsets are being combined, and pitchers are running low on ways to get Bogaerts out.

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For one month early in the 2015 season, Rick Porcello, traditionally a sinkerballer whose fastball sits at 91, led with the four-seam. It was only the second month in Porcello’s career in which the sinker’s position as his primary pitch was usurped by the four-seam, and unlike the other instance of this happening, the magnitude of the shift was noticeable.

It was the beginning of Porcello’s tenure in Boston, his new home after spending the first six years of his career in Detroit, and so at the time, it seemed like focusing on incorporating the four-seam fastball might’ve been part of the early organizational roadmap for Porcello. But the experiment didn’t go well. In eight four-seam-reliant starts, Porcello allowed 31 earned runs in 48 innings, good for a 5.81 ERA and a 4.76 FIP. All of his patented ground balls went missing, his home-run rate ballooned, he walked more batters than usual, and just like that, the four-seam trial run was over. Back to the sinkers he went.

If it really was an organizational thing — that the Red Sox encouraged Porcello to use his four-seam fastball more early in the season, if not just to see what it was like — it doesn’t seem like a bad idea, results notwithstanding. Even though Porcello’s “heater” only sits at 91, he has the ability to ramp it up to 96, and even more important than that, he’s able to naturally generate more spin on his four-seamer than almost any pitcher in baseball. We know that high-spin fastballs can be effective when located up in the zone, even without velocity, and so Porcello seems to possess a real weapon with his high-spin heater.

For whatever reason, though, the plan didn’t work, and so it didn’t stick. Maybe it was command, maybe it was comfort, maybe it was the way relying on the four-seamer affected the rest of his sequences, or maybe it was something else entirely. Whatever the case, Porcello went back to the sinker being his primary pitch, and he hasn’t looked back since. But the four-seamer is still there. And the way he’s using it now is making it more effective than ever. The idea to employ a four-seam approach may not have gone as smoothly as originally planned, but it looks like it’s working itself out anyway.

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Jackie Bradley Jr. has been doing amazing things. To be absolutely clear, they’ve all been doing amazing things. Every last one of them. That 91 mile-per-hour sinker outside? Amazing. That opposite-field roller past the shortstop? Amazing. The reason we bother to pay attention in the first place is because everything that happens out there is amazing, performed by amazing players. Yet Bradley has been particularly amazing. Here’s an amazing thing from yesterday:

Bradley is riding a long hitting streak, and while we don’t really care too much about hitting streaks, on their own, they’re tightly correlated to good offense. That’s what we do care about. This year, Bradley ranks eighth in baseball in wRC+, between Manny Machado and Nick Castellanos. Of course, some things still look a little weird — Aledmys Diaz, for example, ranks second. So looking over the past calendar year, Bradley ranks 15th. That covers 401 trips to the plate, and he’s sandwiched between Machado and Nelson Cruz. Regardless of whether this is for real, Bradley is now definitely a hitter. And in this season, he seems to have taken one more step.

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Yesterday, we tackled the best final seasons for pitchers. Today, let’s tackle the position players, so we can get to the heart of the question of just how good David Ortiz needs to be to crack one of these lists. The rules and breakdowns are the same as before, so I would encourage you to read yesterday’s post to peep those. Once again, big ups to Jeff Zimmerman for data help.

30-39 WAR

Best Final Season, Position Players with 30-39 WAR

Player	Final Season	Age	WAR	Career WAR
Roy Cullenbine	1947	33	4.4	33.8
Chick Stahl	1906	33	3.7	33.1
Tony Cuccinello	1945	37	3.0	32.2
Gil McDougald	1960	32	2.8	39.7
Joe Adcock	1966	38	2.5	34.2
Elbie Fletcher	1949	33	2.4	30.7

The guys on this list are definitely not household names, but there are some interesting, if also tragic, stories here. Let’s deal with the tragic first. There are six players here because one of them, Chick Stahl, committed suicide during spring training of the 1907 season. He had been named the Americans’ (Red Sox) player/manager over the winter, and something drove him to take his own life. This was surely a big loss for the team, as they had been counting on him to help lead them. He was the fifth-best hitter in the game just a couple years earlier in 1904.

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