In ALCS game 4, Breslow faced 6 batters, striking out 4 of them on 16 strikes, and only 3 of 23 pitches actually in the strike zone: Breslow gets them chasing every time.
His bread and butter is the 2-seam fastball tailing away and outside the zone to lefties. Deeper into the at-bat, he gets whiffs on the cutter, 4-seamer and changeup.
These charts have been corrected for Tampa Bay's persistent movement and velocity error, so the horizontal movement on the 2-seamer and changeup are the real thing. Breslow may not be throwing as hard as some relievers, but his location and movement are tempting the batter to chase outside the strike zone, if not quite off the charts.