Andrew Miller transitioned to a full-time relief role in 2012, but it was his 2014 season that really put him on the map.
That year, Miller put up a 2.02 ERA and 1.51 FIP over 62.1 innings for the Red Sox and Orioles. His K/9 was just under 15.
That season was the start of a four-year stretch of dominance from Miller, one in which he averaged roughly 65 innings a season. His 41.8% strikeout rate was tied for the highest in baseball over that time. His highest season ERA was 2.