How do you measure a truly great starting pitching season? Having an ERA that starts with a “1” generally qualifies, but there’s some obvious issues with that. First, that’s happened 82 times in the last 100 seasons, making it notable but perhaps not unthinkable. Second, obviously, are the flaws inherent to ERA, most importantly that it’s not adjusted for ballpark or league. Pedro Martinez (2000), Sandy Koufax (1964) and Carl Mays (1917) all had an ERA of 1.74. Clearly, none of them were facing the same kind of offenses.
You could, if you wanted, go by WAR. Steve Carlton‘s 1972 and Martinez’ 1999 make sense atop the list, but convincing people that Bert Blyleven‘s 1973 was the third-best season ever or that Bob Gibson’s legendary 1968 was merely his third-best season seem like tougher sells. Besides, since that’s a counting stat rather than a rate stat, it means no modern-day pitcher will ever be able to come close, because it seems pretty safe to say that we aren’t seeing a starting pitcher top 320 innings again, as both Carlton and Blyleven did.
FIP? That’s better, though still imperfect. Martinez, again, and 1984 Dwight Gooden top the leaderboards there, followed by a pair of guys essentially playing a different sport, Walter Johnson and Pete Alexander in 1915. (In 1915-16, Johnson pitched 706.1 innings; he allowed one home run. It was, as were 24 of the 97 total dingers he allowed, an inside-the-park job.) FIP also assumes some league-average inputs, and if we want “best-ever” perhaps we don’t want to assume any kind of average; like WAR, you’d also have a tough time winning a bar argument with something that you need to explain formulas for.
Enough setup, then. To the point, now. Clearly, there’s many different ways to do this, and no obvious, unassailable answer. You could make an argument for probably a dozen different years as the “best” starting pitching season of all time. What I’m doing, today, is to break it down into the most important things a pitcher can do that are more or less entirely within his control:
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