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Bud Norris, ground balls, and a comparison (or six)

Just a few days after Ed Wade signed a two year contract extension to remain the Astros' GM until 2012, Wade wasted no time in letting a "key personnel decision" be made known. Upon learning that Bud Norris recently bought a home in the Houston area, Wade quipped to Alyson Footer that:

Bud Norris needs to make this team. I teased him after he bought a house in Houston. I said, do you get good gas mileage? It's a long way to Round Rock.

While I suppose it's possible that Norris could not start the season with the Astros, it would take him severely under-performing or getting injured. Knock on wood neither of those things happen.

Star-divide

In light of a recent two part series on Fangraphs covering groundballs and their relation to other peripheral statistics of pitchers, I immediately thought of Norris and how he fits into the discussion. His ground ball rate in the minors was a solid 47.4%, which paired with his excellent strikeout percentage explained in large part why Bud was a successful minor league pitcher. The issue that comes to mind, as he makes the transition to the majors, is how well can this trend continue?

to gain a little perspective, I found a blog post which detailed the best ground ball pitchers in the minors entering the 2009 season, a number of which made their ML debuts in 2009. Brett Cecil (Toronto), Rick Porcello (Detroit), Brett Anderson (Oakland), Trevor Cahill (Oakland), David Price (Tampa), and Vin Mazzaro (Oakland), all displayed fairly severe ground ball tendencies (50% and up) in the minor leagues, so how they fared in their first substantial tour of duty in for their big league teams could be an decent indicator for things to come for Mr. Norris:

Pitcher MLB IP MiLB GB% MLB GB% MiLB FIP MLB FIP MiLB HR/FB% MLB HR/FB%
Brett Cecil 93.1 60.2% 42.6% 3.11 5.37 6.8% 14.8%
Rick Porcello 170.2 65% 54.2% 3.86 4.77 6.6% 14.1%
Brett Anderson 175.1 56.5% 50.9% 3.23 3.69 9% 11.1%
Trevor Cahill 178.2 59.4% 47.8% 3.20 5.33 5.1% 13.2%
David Price 142.1 50.4% 42.3% 3.55 4.47 11.1% 10.7%
Vin Mazzaro 91.1 53.6% 39.1% 3.85 4.93 5.9% 9.5%
Bud Norris 55.2 46.3% 37.2% 3.67 4.77 5.7% 12.9%

 

Certainly different results for each of these pitchers:

  • Brett Cecil made his last start of the season on September 10th, and also saw the greatest regression in his GB ways after his move to the major leagues.
  • Rick Porcello had a shiny 3.96 ERA in his rookie season, but that mark belied a true performance that wasn't nearly as good. A FB% below 30% is ridiculous for even someone as adept at inducing grounders as Porcello. While he may still be a ground ball fiend in 2010, a below average K/BB rate and BABIP regression means a less than stellar season may be ahead
  • The most impressive of all the young starters is Brett Anderson. He translated his great potential into a rookie season worth remembering. His transition was not bumpy at all, and playing in Oakland's spacious home ballpark is another advantage for the A's starter.
  • Anderson's spectacular 2009 is in stark contrast to his teammate Trevor Cahill. His K/BB rate of 1.25 is especially bad considering that his K/9 rate is a Moehlerian 4.53. It's possible that he will allow fewer home runs this season, but that's about the only bit of optimism I project for the youngster
  • After closing out the defending World Series Champion Boston Red Sox to win Game 7 of the ALCS in 2008, David Price fell well short of expectations in 2009 as a full time starter. His ground ball and fly ball rates were very close (41.5%/39.4%) and he displayed none of the control he had in the low minor leagues. Still, talent like his can usually shine through. He wasn't at the top of the prospect rankings for no reason
  • Vin Mazzaro shared the low K rate similarity with teammate Trevor Cahill, but his ground ball rate actually fell below that of his fly ball rate. In all honesty, I went into this article believing that I would be blown away by the young stable of Oakland pitchers. After looking at their past performances and their projections, only Anderson left me as impressed as I thought I would be
  • In a way, it's not fair to have Bud Norris on this list since he displayed a solid, but not over powering GB rate in the minors. What's more, he totaled only 55.2 major league innings in 2009, a sample size that's not particularly large. Still, we can see that a good ground ball pitcher in the minors becomes a pitcher with average tendencies in the major leagues. I'll say this though, outside of Anderson and Price, i think Norris has the best season of all these pitchers in 2010. Norris may well end up as a relief pitcher before it's all said and done, but his ability to induce swings and misses can overcome to a large extent his wildness. A majority of these other pitchers cannot say the same.

For everything that Bud Norris is, he is not in all likelihood going to be in the company of these pitchers, in terms of ground ball rates. I'm not saying it's impossible, but even the best minor league pitchers see some degree of regression once they make the leap to face major league hitters. Basically, it's difficult to walk up the down escalator if ya catch my drift.

Again, if Norris can avoid injury (knocking on wood again), he should have a good season worthy of mention along side the rest of the hurlers in this article, just don't expect Bud to keep our infielders all that busy.

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Normally I would say that Norris’ sample size in the majors is too small to project whether his GB% is likely to fall below his minor league rate in the future. However, the fact that all of the young pitchers you selected had ML groundball rates below their minor league rates is telling. And that surprises me. Usually flyball or groundball tendencies aren’t expected to change a lot over time. It would be interesting to know why the GB rates regress in the pitchers’ first ML season. If all of these pitchers have good velocity, perhaps major league catchers call for more 4 seam fastballs in order to show ML batters the young pitchers’ best velocity. However, that seems less likely to be a common explanation for seven different pitchers. Maybe minor league batters swing at (and make contact with) more pitches which fall below the strike zone. But when these pitchers get to the majors, batters are less likely to swing at the low pitches. Did all of these pitchers have higher BB% in the majors?

by clack on Feb 23, 2010 6:47 AM CST reply actions  

Couldn’t you consider the statistics for all the young pitchers mentioned above a small sample size and we’ll also a regression towards the mean next season?

by timmy_ on Feb 23, 2010 10:06 AM CST up reply actions  

Maybe. I assume (though not certain) that all of the minor league innings are significant enough to avoid sample size problems. And, yes, all of the major league innings for these pitchers probably fit the small sample size problem, in terms of predicting each player’s future GB%. However, if the variation is supposed to be random, I would have expected some of the players to have GB% greater than their minor league GB%, as well as some below. The fact that all of them were below the minor league numbers, makes me suspect that the direction of the variation isn’t random.

by clack on Feb 23, 2010 10:59 AM CST up reply actions  

May be just experience

It makes sense that majpr league batters are better than minor league batters.

It also may be that the new pitchers need more experience and comfor level at the majors. I noticed, for example, the percentage of groundballs in the sample increased with the number of innings pitched in the majors.

Astros fan for life

by Joe in Birmingham on Feb 23, 2010 11:59 AM CST up reply actions  

It seems to me that, since ground balls are a result of sinkers & fork balls….that probably the major league hitters are better at laying off those pitches & waiting to get something up a little more in the strike zone, no?

by titansfan4ever on Feb 23, 2010 1:12 PM CST up reply actions  

that was the idea I tried to convey in my post. it seems like the most likely explanation.

by clack on Feb 23, 2010 1:20 PM CST up reply actions  

My assumption was more along the lines that minor league hitters, even ones in AAA, simply slap more balls onto the ground than in the big leagues, because they’re a much less skilled group as a whole.

by OremLK on Feb 23, 2010 11:19 AM CST up reply actions  

I thought about that too….except that I would expect there to be more GB pitchers in the minors, if that is true. But my impression is that there are plenty of flyball pitchers in AAA. I haven’t seen the stats on overall PCL and International League GB% and Fly% rates…but just based on looking at minor league pitchers’ stats over the years, it doesn’t seem like there is a disproportionate number of GB pitchers.

by clack on Feb 23, 2010 11:37 AM CST up reply actions  

Bud the Hoss

My assumption since last August or September was that Bud Norris would be a “hoss” for the Astros this year, unless his arm tires. I should leave open the option he’ll struggle but I see him as a solid, dependable contributor.

Astros fan for life

by Joe in Birmingham on Feb 23, 2010 10:37 AM CST reply actions  

Yeah, and how comforting it must be when your GM tells you “I hope your car gets good gas mileage”. Why doesn’t he just come out and say “Either be a beast, or hit the road”.

by titansfan4ever on Feb 23, 2010 1:18 PM CST up reply actions  

I found that to be pretty funny. It sounds like something I would say to someone to try and motivate them just a little bit.

Miss-placed Houstonian living and going to school in the wilderness of Wyoming. Fresno St. 28 - Wyoming 35 (2 OT)!!! Hands down best game I have ever been to.

by BigNate7 on Feb 24, 2010 9:33 AM CST up reply actions  

I kind of liked it also. It’s kind of light needling, so it doesn’t make the kid mad. But it also sends the message, “don’t get a big head.”

by clack on Feb 24, 2010 12:52 PM CST up reply actions  

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