Fulmer House: Who will win American League Rookie of the Year?

When looking at awards for the Major League Baseball regular season, few of the choices are very obvious. Corey Seager will win the National League Rookie of the Year, but there are questions in just about every other race, including American League Rookie of the Year.

The National League MVP is down to just one or two batters, and the American League MVP seems fairly clear cut. The American League Rookie of the Year campaign is one that, a) isn’t being talked about very much, b) is a complete crapshoot. So let’s look at some names to keep our eyes on.

Let’s start with a simple Fangraphs search for American League rookies. The first name that pops up? Gary “Kyle Schwarber” Sanchez. I immediately think, alright, yeah this is over. However, looking at his plate appearances and games played, he just doesn’t have a lot of service time this year compared to number two in the query, Tyler Naquin. Naquin has 106 games compared to Sanchez’s 41. In addition, Naquin has 333 plate appearance compared to Sanchez’s 178. This really makes it hard to qualify Sanchez.

The case for Naquin is large. In his season, he has accumulated 2.1 fWAR, while triple slashing .302/.372/.539. His weighted on base average (better OBP) is .381 which would put him way above average. The offensive numbers translate really well and you would think he would be worth more in WAR. However, Fangraphs doesn’t like his defense. They use Defensive Runs Saved and Ultimate Zone Rating in their WAR calculations, and DRS and UZR are simply not reliable enough.

If you proceed to look at Baseball Reference you’ll notice that they really don’t like his defense. Let’s see if we can figure out why. Baseball Reference uses components of DRS to evaluate defensive status. All of those numbers, reliable or not, massively impact how his WAR numbers look because they are so bad. I wanted to get a better representation of what his actual talent is. A good way of looking at that is the Inside Edge Fielding data on Fangraphs. The way that data is read is not very complicated and can be found in more detail here. Here’s the conclusion on Naquin.

He makes the catches he should. The easy fly balls. Everything else he struggles with. Of the 51 opportunities he’s had, where the odds of him making the catch were forty percent or less, he hasn’t made a single one of those catches. However, of the 159 “routine” catches, he’s only messed up 3 of them. Ultimately he makes the catches he should. WAR won’t represent that so the number may not be fair to Naquin. Offensively, he’s definitely been the best player with a good sample this season.

There’s one more player that’s in the hunt for the award. That’s Tigers pitcher, Michael Fulmer. Among pitchers with at least 140 innings pitched, his earned run average is second in the American League. Ahead of him is Masahiro Tanaka, and he’s tied with Chris Sale. Fulmer has been really, really good. Baseball Prospectus has his WARP at 3.3 (much more reliable than Fangraphs’ WAR because it uses DRA instead of FIP) and a cFIP of 88. cFIP is used in the same way ERA- or OPS+ (cFIP counts down) is. That puts him 12 percent better than league average. Considering he’s a rookie, that’s impressive.