The best MLB player at each position in 2018

Designated Hitter: J.D. Martinez, Boston Red Sox

2018 fWAR: 5.9

Here’s your other set of teammates, folks. This was Martinez’s second straight season of 40-plus homers and 100-plus RBI. When comparing 2017 to what he just did during his first year in Boston, the slugger made a huge adjustment to changeups.

After posting just a .643 OPS and 74 wRC+ with a 44.1% strikeout rate against that offering two seasons ago, those numbers improved to .949, 164, and 22.0%, respectively, in 2018.