Since he's come into the league, only three relievers have struck out more batters per inning than Dellin Betances. This year, no reliever walked more batters per inning than Dellin Betances. In related news, only one Yankee pitcher has pitched fewer innings this postseason than Dellin Betances.
Across the country, the Giants' Matt Moore has struggled with his command. Home run rates, walk rates, and generally vacillating production are the command-related issues that have possibly kept him from being his best self on the mound.
Matt Moore and Dellin Betances both tuck their thumbs on their four-seam fastballs.