If Cal Raleigh Does It, When Will It Be?

Cal Raleigh is hot. Thumping three homers in a span of two days has put Big Dumper at 56 on the season with 11 games left to play. That binge gives him a realistic shot at hitting a nice round 60 on the season, a threshold that only an elite few sluggers have ever reached. He’s doing it as a catcher, which is absurd. He left the old single-season home run record for catchers in the dust a long time ago.
As I learned all the way back in first grade, 62 is only two more than 60. Given Raleigh’s predilection for blasting bombs in bunches – he hit six in six games earlier this year, and nine in a separate 11-game stretch – Aaron Judge’s single-season AL home run record (and for some people, though not me, the “true” home run record) is definitely in play.
As is tradition at FanGraphs, when someone goes for a home run milestone, we forecast when it might happen. Whether it’s Judge’s quest for 62, Albert Pujols’ push for 700, or Shohei Ohtani’s bid for 50/50, it’s fun and useful to predict when the actual milestone game will occur. I’ll start with the methodology, but if you’re not into that, there are some tables down below that will give you an idea of when and where Raleigh might hit either his 60th, 62nd, or 63rd homer.
I started with our Depth Charts projection for Raleigh’s home run rate the rest of the way. That’s based on neutral opposition, so I also accounted for park factors and opposition. Since Raleigh is a switch-hitter, I used the specific pitchers the Mariners are expected to face to determine whether he starts each game batting lefty or righty, and also used those pitchers’ home run rate projections to determine opponent strength. I used a blend of projected starter, home run rate, and observed bullpen home run rate to come up with a strength of opposition estimate. That let me create a unique home run environment for each game. I also told the computer to randomly select how many plate appearances Raleigh receives each game, with an average of five most likely but some chance of four or six. Read the rest of this entry »