I’ve read a few books of late that impress upon me how many more innings pitchers would throw, pre 1920. By how much though?
I pulled some data from Baseball-Reference.com. I started with a random assortment of pitchers. Five were from the deadball era, and 5 would be considered modern. All are either in the Hall of Fame, or heading there. The pitchers are:
Deadball
- Brown
- Johnson, Walter
- Mathewson
- McGinnity
- Waddell
Modern
- Clemens
- Glavine
- Johnson, Randy
- Maddux
- Martinez, Pedro
I pulled their career data from Baseball-Reference.com and looked only at the average # of innings pitched. What I learned was:
- the modern pitchers averaged 6.55 innings per game
- the deadball pitchers averaged 7.24 innings per game
So no surprise – the deadball pitchers would go deeper into a game. But the 10% difference surprised me; I would have expected a bigger difference. I can’t draw any conclusions here as this is a very non-scientific survey. As this was my first foray into analysis I decided to get a bit more rigorous. (As if I know what that means….)
Digging further…. I pulled from Baseball-Reference.com a list of the top 25 pitchers based on WAR from 1876 to present. I then calculated the number of innings pitched per season. Some findings:
- Pud Galvin led the list, averaging over 457 innings per season. (Never knew much about Pud Galvin!)
- the 11 pitchers from the deadball era were at the top of the list
- the first modern pitcher was Robin Roberts
- The overall average innings pitched per season for all 25 was 284 innings. The average deadball pitcher threw 353 innings per season. The average modern player pitched 238 innings. A difference of over 30%.
These results surprised me. Remember, I am only looking at the top 25 pitchers based on WAR. The modern pitchers included many of the durable pitchers of the era: Niekro, Ryan, and Perry but no modern pitcher beat any of the deadball pitchers. What was most surprising was how the group sorted with every top WAR Deadballer being above even the best of the modern players.
And if you asked which of the Top 25 WAR pictures would lead the moderns, I would not have guess Robin Roberts. Probably wouldn’t have been in my top 10. He’s the answer though.
I then checked the modern players. Justin Verlander lead the league this year with 251 innings pitched. That would put him right in there with the other modern players, but nowhere near the deadballers. That sent me back to baseball-reference. I did an easy sort showing that the leaders in innings pitched is dominated by the deadballers. Only one modern pitcher cracked the top 100 for the all-time list of innings pitched per season. The first modern to appear is Feller, at #79. Roberts is next at #102.
Verlander’s 250 innings for the year would put him at 482 for all time. 2011′s iron man is a babe in the context of history.
So the conclusion that deadballers were more durable did not surprise me, but after my initial (flawed) investigation, I was surprised at how much more durable they were. Some things to investigate:
- Who was Pud Galvin! And how durable was Robin Roberts?
- Is there a relationship between the # of innings pitched per season and WAR? Is it inverse, or random, or neither?
- Why were the deadballers so much more durable?
Now for the caveat – I have no clue if what I am doing is accurate! It was interesting to me but this is the first time in my life I have done any sort of analysis like this. I am not a statistics person and can barely help my kids with their middle school math homework. All feedback is most welcome!
Speaking of durability, I just learned on Baseball-Almanac that in 1906, a pitcher named Jack Taylor was relieved, ending a streak of 1,727 innings without needing a relief pitcher. That is over 190 games without going to the bullpen!
