Austin Slater, the Best Role Player in Baseball

I’m gonna start this one with a hot take: superstars can be boring. Before the pitchforks come out, let me explain myself. I love it just as much as everyone else when Aaron Judge obliterates second-deck homers, Jacob deGrom throws triple digits with ease, or Shohei Ohtani, well, does both. But the way star players contribute to their teams is quite predictable. Provided he’s healthy, Mike Trout’s name will be somewhere on the top third of the lineup card with a little number eight on the position column 155 times a year. Manager Phil Nevin doesn’t have to make any difficult decisions about when or where to start him.
But for most fans, the base unit of their baseball viewing experience is a team, rather than an individual player. The average Hennepin County resident would probably say they’re a Twins fan rather than characterize themselves as a Carlos Correa or Byron Buxton supporter. Often times, the same principle is true of baseball analysis. Sure, we write a lot about single players, but individuals don’t play in a vacuum. My favorite part of every free-agent signing to write is about how a new player fits into the roster they’ve just joined, and WAR, possibly the most referenced metric on this site, is literally an estimation of how much a team victories a given player adds. Heck, we had 58 people comment on a piece about projected team standings even before the majority of free agents had signed.
So, back to my original thesis. The game’s best players are incredibly awe-inspiring in what they can do on the field, but we don’t get to think about the role in which they’re best used, because that role is just “all the time”. Earlier this week, I wrote about Dylan Moore, who signed a three-year extension with Seattle. He’s not the most exciting player to write about as an individual; he doesn’t have monster exit velocities or dominate the contact leaderboards. What he does do, though, is patch about ten holes the Mariners have or may have in the future due to platoon issues, defensive limitations, or injuries. Seattle’s front office realized that a single non-starting player could be the solution to many team-specific problems and gave Moore a small pile of money to remain in the Pacific Northwest for the foreseeable future. Moore was fun to write and think about because of the specific ways in which he complements the team around him, and I like this type of analysis because it’s much more unique to each individual player and their team.
It’s time we get to the subject of this piece. In my Moore article, I found that nearly half of his plate appearances came against left-handed pitching, which placed fourth among righty hitters. The man who ranked first? Austin Slater of the Giants. An up/down bench outfielder for his first three years in the league, he earned a full-time roster spot in 2020 and has made the most of it despite his non-starting role, amassing 4.6 WAR in 735 plate appearances (3.8 WAR/600 PA). While he’s appeared in at least 125 games in each of the last two seasons, he’s only made 116 starts. But starting the game on the bench hasn’t seemed to affect his performance, with a 118 wRC+ during that time. Read the rest of this entry »







