My Favorite Player: Rob Johnson
Players like Omar Vizquel, Cesar Izturis, and Adam Everett have always intrigued me. They're the players that manage to be given starting roles and maintain those starting roles while putting up wOBAs under .300. Excellent hitters are fun to watch, but I find that it's these terrible hitters that are the most fun to analyze. That brings me to the subject of this here FanPost: Rob Johnson. I understand people are annoyed by Rob Johnson and all the love he gets for calling a great game, but for some reason I enjoy watching him. Excellent hitters are boring; there's no hope associated with them. Cardinals fans don't start the season hoping Albert Pujols puts up a wOBA above .400. That's pretty much a guarantee. We are fortunate enough to have Rob Johnson around, a player we get to hope posts a wOBA above .300 this coming season. I understand that FanPosts don't hide information the way front page posts do, but I've always liked the idea of the jump so... an analysis of Rob Johnson's hitting coming up after the jump!
Glad you followed me all the way down here. Fangraphs recently put up splits for each player, something that's truly a great thing to explore if you want to waste a couple hours. How about we check out Rob Johnson's splits from 2009?
One thing I remember Dave Cameron mentioning during the season was Rob's improved walk rate after the season started. Check out his BB% by month:
Mar/Apr: 2.2%
May: 8.9%
June: 7.3%
July: 16.1%
August: 6.3%
Sept/Oct: 12.5%
I didn't realize the shift was that drastic. He started the season walking about as much as a paraplegic and suddenly shifted to an average/above average walk rate. I'm not saying we should discard that 2.2%, but it looks like a massive outlier. Perhaps it was first month jitters? Maybe a coach talked to him about walking? Nothing can be said for certain, but going forward I feel moderately comfortable projecting him with a 9.0% or greater walk rate (9.0% was his walk rate this past year).
Another split that was very intriguing to me was his ability to hit left handed and right handed pitchers. Vs. Lefties, Rob had a 10.9% walk rate, a 19.5% K rate, a 24.2% LD rate, and a 14.3% IF fly ball rate. That infield fly ball rate is troubling, but otherwise those are pretty solid peripheral stats. (He also had a 0.0% HR/FB rate, which is...not good.) In comparison, against righties Rob had a 8.1% BB rate, a 25% K rate, a 19.8% LD rate, and a 24.3%(!!) IF fly ball rate (5.4% HR/FB against righties). So, he's got the HR/FB rate going for him against righties, but overall he seems to have the platoon splits we'd expect from any player. Now here's the weird part: Rob's wOBA vs. lefties was .232. Rob's wOBA vs. righties: .296. Uh... okay.
Rob's BABIP vs. lefties was .212 and his BABIP vs. righties was .300. Rob Johnson doesn't seem to have Griffey legs. I wouldn't call him fast, but I also wouldn't describe him as extremely slow. So the good news is, we should expect that BABIP vs. lefties to increase by quite a bit next season. Unfortunately, we should also expect his BABIP vs. righties to decrease because it's kind of hard to get on base when you pop the ball up so much--overall, Rob's IFFB% was 20%, and his BABIP on fly balls was .095. We can hope for his IFFB% to to decrease with more experience, but after watching Yuni I'm not as confident about that. Still, I think we can expect Rob's overall BABIP to increase next season, and with that we should probably expect a BA of .230 or greater (.250 may be pushing it but I will choose to remain hopelessly hopeful).
Rob's home run potential is another thing that makes me curious. He's never hit too many home runs and he only had two last year. But the standard distance of those two were 370 feet and 430 feet. Clearly we should conclude that Rob Johnson possesses some sort of Herculean strength and will hit 15 home runs this year. Okay, maybe not. But still, that's indicative that he at least has a little power. It's interesting that those two came off of right handed pitchers. Rob's GB% against lefties and righties was 33.3% and 51.3% respectively. His FB% against lefties and righties was 42.4% and 28.2% respectively. Against lefties he hit the ball in the air a bunch more, while against right handed pitchers it seems as though he was just pummeling the ball into the ground. Yet, he had a much higher IFFB% against righties than lefties and he hit those two home runs of sizeable distance. Perhaps this is just too small of a sample to draw conclusions from, but it sure seems like he should be hitting home runs against lefties.
Okay, so what was the point of all of this? I see I've written quite a bit more than I thought I would. But I guess that's why I like Rob Johnson. He's just so darn interesting. I dunno if there was much of a point. If there was a point I suppose it'd be this:
Rob Johnson was worth .4 WAR in 80 games last season. He managed to do this last season by having a wOBA of .274. I think we should expect a bit better of him next season. Using Fangraphs, I decided to do a projection of Rob. I gave him 105ish games played, a .230ish BA, 25ish 2B/3B, 7ish HR, a 17%ish K% (he struck out 22.0% of the time in AAA in 2006 and bumped it down to 14%ish for 2007-2008, I'm hoping for a similar adjustment to the league), a 10%ish BB%, and a handful of stolen bases. To be completely honest, I do not think this is unreasonable at all (perhaps the 7ish home runs but I think he's got it in 'im). Fangraphs tells me that this is worth a .299 wOBA (still under the .300 threshold of interest!) and that, from a catcher, that is worth 1.2 wins. And this is only over 105ish games! Fill in the rest of the season with Bard or Moore and I think you've got yourself at least 1.5 WAR from the catcher next season.
Of course, much of the information I used was from a limited sample size, so a lot of this could mean nothing. But I can hope it means Rob Johnson is approaching the ability of an average catcher, which is great news for the Mariners. If you're still reading this, congratulations! You've managed to read 1000 words about Rob Johnson.
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I think the sample size is a little too small to be drawing any conclusions off his platoon splits from last season
though the IFFB rate is rather alarming no matter how small the sample
Of course, LD rate stabilizes over 3 times faster than IFFB rate, so....
Pop-up rate is ‘stable’ (not really the right word, but whatever) after 500 PAs, LD rate at 150. Johnson has fewer than 300 career at-bats.
I was thinking more in relation to BABIP as an example of too-small sample size
also, Jeff has constantly re-iterated that even a single season sample is too small to get meaningful information from platoon splits
by seattlebruin on Feb 8, 2010 11:18 AM PST up reply actions
I'm not talking about platoon splits.
The overall sample size is extremely small, which means it’s probably not a great idea to make too much of the IFFB%, his LD rate or anything else. Still, contact rate and LD rate stabilize relatively quickly (as opposed to IFFB rate), and his LD rate is exceptional. If you DO care about the IFFB%, you’ve got to account for the LD%.
I didn't really intend to get meaningful information
I just thought the data was interesting and felt like sharing it
And I thank you for your efforts.
I still hate him.
Thanks Fogel
I appreciate hearing perspectives of less popular players. I agree it can be fun to see how they do, it’s got a little bit of a rooting-for-the-underdog feel to it even if I would ultimately love to see him bumped off the roster by a better catcher.
I noticed in a comment above that LD rate stabilizes quicker than the fly ball rate, so maybe I can be optimistic and watch him to see if he can get that fly ball rate lower.
I don't think you can project him to have a career high walk rate.
I have him more as a .290 wOBA hitter.
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He can't project improvement?
And again, his ‘career’ is 300 ABs. Being restrained by his ‘career’ to date seems odd.
I'm including minor league numbers. People don't come to the majors and improve their BB%.
I mean, some do, but to project it is strange
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Fangraphs has the option of 9%-11% when projecting BB rate
I said 10ish because that’s what the wOBA was based off because they just take the middle of the interval. I think he can definitely have a walk rate between 9% and 11%.
You’d think his walk rate would’ve decrease as last season went on, due to pitchers figuring out he isn’t much of a hitter. His walk rate didn’t really drop off. This says to me that he has a pretty good ability to take a walk, regardless of whether he showed it in the minors. I understand that this is not a concrete fact and certainly you can make the case that he’ll go back to the 8ish% that he showed in the minors, but I would hardly call it irrational to project that he maintains or even improves on his 2009 BB%.
It's almost never prudent to project anyone to have a career year.
Do the same fangraphs projection for Adam Moore (same level of optimism, etc) and see what WAR you come up with.
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By career you mean including minor league years, no?
In that case, the only statistic I’m projecting a career year for is BB%, which, as I’ve explained, I believe there is reason to do so. It’s certainly not the strongest reason and I completely understand that many people would disagree with my opinion on his BB% but saying I can’t project him to have a career high walk rate is a bit extreme, isn’t it?
I don’t understand how you project any young player. Do you restrict them to the statistics they’ve had in the minor leagues?
I’d have Moore at about a .308-.313 wOBA if he gets playing time next year, but it’s hard to say because he’s had almost no major league playing time.
Well we're in the age of stats + scouts...
So unless you have a scouting opinion on an improved plate approach, there’s really nothing to imply that he will have a career year except your own conjecture.
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Except that we know that players tend to retain the ability to draw walks, and Johnson was never horrible at doing it in the minors
that, coupled with improvement over his first season in the majors is reason for at least cautious optimism with regards to his ability to get on base. It’s not like Fogel is projecting him to walk in 20% of his plate appearances or anything
I'm not saying it's crazy, I just am questioning whether or not a career-high walk rate is the most likely outcome.
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When you say something like
there’s really nothing to imply that he will have a career year except your own conjecture.
It makes it seem like I have absolutely no basis for my projection. If you want to look at Rob’s 2009 as a complete anomaly, that’s your choice. I can choose to see it as just the beginning of an improved approach at the plate. Neither of us are wrong, as there are more than one way to interpret data. I do have backing for my opinion, just as you have backing for yours.
O-Swing% is the number most strongly correlated with BB%
Using the best-fit equation for last year’s line, we’d expect Johnson’s O-Swing% to lead to a BB% of 8.9%. He actually came in at 9.0%.
Granted, not everybody comes in on the line, since the correlation isn’t perfect, but we’re dealing with an R of -0.72, so it’s pretty good. Based solely on Johnson’s plate discipline numbers over 290 Major League PAs, it is perfectly reasonable to project a ~9% walk rate.
by Jeff Sullivan on Feb 9, 2010 12:25 PM PST up reply actions 2 recs
Very nice
Though I feel that, to be truly rigorous, March and April as well as September and October should be separated.
I don't think so
I mean, I was just using what fangraphs gave me. Months are arbitrary cutoffs, and with very very few games being played outside of the April-September time frame I don’t see a need to separate those games out.
It's grouped that way because there were no actual games in March and only four in October.
I think any percentage for October on its own would be way too small of a sample to even consider.

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