What Remains of Clayton Kershaw
For major league pitchers, the end always feels depressingly close at hand. In a game increasingly dominated by power and velocity, losing a tick can be the difference between sneaking a fastball past someone and watching a home run trot. Throw in elbow injuries, blisters, and hitters obsessively watching video looking for any exploitable edge, and it’s a miracle that any pitchers can sustain success.
Clayton Kershaw is no exception to this pattern. He may be the greatest pitcher of the 21st century, but that doesn’t give him special immunity from velocity loss or a license to avoid injury. Gone are the days of Kershaw posting sub-2 ERAs regularly. That’s partially due to the changing offensive environment, to be sure, but it’s also a reflection of the fact that Kershaw is aging. His strikeout rate fell last year to the lowest rate since his rookie season, a pedestrian 23.9%. He made less than 30 starts for a third straight season. His fastball velocity declined 1.5 mph. Age comes for everyone, or so it seems.
When Kershaw returned from a season-opening IL stint, he did so with old-man wiles. His velocity was down another tick, now approaching 90 mph. As Ben Lindbergh ably chronicled, Kershaw’s plan was to stick with what worked in 2018 and survive on sliders and first-pitch strikes. He became perhaps the most extreme pitcher in baseball, piping in first strikes nearly three-quarters of the time and afterward departing the strike zone entirely. He accomplished that trick by throwing his fastball 61% of the time to open at-bats and only 33% of the time after that.
However, even these extreme changes couldn’t hide the fact that Kershaw was slipping. At roughly the midpoint of the season, July 1st, Kershaw was 36th in WAR among pitchers, sandwiched between Kyle Gibson and Sonny Gray. He was marginally better, 24th, by RA9-WAR, but even there, it was weird seeing Kershaw’s name next to Yonny Chirinos and Zach Eflin. Some of this came from a limited workload, but his 3.23 ERA and 3.76 FIP told the same story. It wasn’t just the ball, either: his 77 ERA- and 89 FIP- were his highest since his rookie year, and his 22.7% strikeout rate was down even from last year’s low level. Read the rest of this entry »
