Building a Record-Breaking Strikeout Rotation
A few weeks ago, I ventured into the topic of whether the 2016 Cleveland Indians’ starting rotation had a chance at breaking the league-adjusted team strikeout rate record held by the 1990 Mets. Those Mets (comprising a front four of Dwight Gooden, David Cone, Frank Viola, and Sid Fernandez) struck out 47% more batters than a 1990 league-average rotation. That was ridiculously good in 1990, and today, it’d be even more incredible were a team able to do it, given the increase in strikeouts league-wide and the expectation that there probably is a ceiling to the strikeout trend. (Because there has to be, right?)
The reason we focused on Cleveland was simple: they almost reached the level of those Mets for a few months in the beginning of the 2015 season. In April and May, they were striking out around 27% of the batters they faced, a mark which nearly approximated the sort of video-game numbers required to match the league-adjusted total of the 1990 Mets. Though they finished first in baseball by striking out 24.2% of batters (which was also the highest strikeout rate for a starting rotation in baseball history), they finished only 41st-best in terms of yearly league-adjusted K rate. Ho-hum. The conclusion of that previous article was, unsurprisingly, that Cleveland would have to outperform their expectations by a sizeable amount to have a chance at the 1990 Mets.
But one of you astute, noble readers was not entirely satisfied with that rational answer. Instead, phoenix2042 challenged us by putting forth a question: what would a starting rotation that could beat that record look like in the modern game? Which 2016 personnel would a team require in order to best a strikeout rate that’s 47% better than the league average? Well, phoenix2042 — and the rest of you wondering readers — this piece aims to answer that question. We will build rotations worthy of a video game, and they will best the 1990 Mets.
First, as before, let’s look at what rotation-wide strikeout rates would be required to break the record in this coming season. I’ve taken the average yearly increase in rotation strikeout rate for each league: over the past 30 years, strikeout rates for starting rotations have increased by about 0.2% per year, on average, and at a slightly higher rate in the past 10 years. Averaging this trend, I calculated the so-called “holy grail” strikeout rate of just over the 1990 Mets (i.e. >47% above league average):
2016 Projected League Average (Est.) | “Holy Grail” Team Strikeout Rate (Est.) | K%+ | |
American League | 19.5% | 28.8% | 148 |
National League | 20.3% | 30.0% | 148 |