Gary Sanchez has a .197 batting average on balls in play (BABIP), the second-lowest of any qualified hitter this year. That's actually understating it, to some extent; that .197 mark would be the lowest BABIP of any qualified Yankees hitter in the last century. It's a big part of why Sanchez is currently hitting a disappointing .190/.291/.430 after going 0-for-4 in the Yankees' 2-0 loss to the Mets on Sunday.
Because it strips out strikeouts and home runs, BABIP exists to tell the story of only what happens when the ball is put into play, on only those plate appearances where a fielder can make an impact.