Catching up on Career Milestone Projections

Jacob deGrom tallied his 2,000th strikeout last week, providing another late-career achievement that might be engraved on a Cooperstown plaque sometime in the 2030s. That deGrom would reach 2,000 strikeouts seemed almost certain back at the end of the 2020 season, when he was 641 away. At that time, he’d struck out at least 200 batters in four of his six non-pandemic seasons. The first of those two other seasons was his 2014 NL Rookie of the Year campaign, when he didn’t debut until May 15, and in 2016, injuries limited him to just 24 starts. But since 2020, deGrom has been an example of Zeno’s paradox, seeming perpetually stuck in medias res. Achilles did eventually catch the tortoise, and deGrom and calculus won the day.
deGrom’s journey to 2,000 is a good reminder of why I like to occasionally harass ZiPS for milestone probabilities rather than simply dividing a player’s remaining distance by his most recent seasonal number and calling it a day. Whether or not there are infinite universes where every possibility happens, in this one, tendons tear and players age. A player can be on pace to finish with 500 home runs for a decade and never come particularly close, while another can sneak in the back door to a milestone that nobody saw coming, as Nick Markakis threatened to do late in his career.
The uncertainty is what makes baseball (and life) interesting. I can tell you that Aaron Judge needs 115 homers to make it to number 500; I have a calculator for that, and even if I didn’t, I was once a third-grader. But the road is hard to map, and the aging curve, performance models, and injury models in ZiPS give us a better idea as to the probability that Judge will hit 500 or 600 in this particular universe. It’s no fun to have such a tool and not deploy it, so it’s a good time to do an update on baseball’s search for pretty, round numbers. Read the rest of this entry »




