By FanGraphs run value, the best change-up in baseball among relievers is Devin Williams’ “Airbender”, a pitch so good it has it’s own nickname. The second best change-up among relievers this year; it belongs to Raisel Iglesias.
He throws it 90 mph, he throws it to right-handers and left-handers, he throws it in any count, and when he’s locating it, its almost impossible to hit. Against the change-up, hitters this year have a .148 batting average, a .245 slugging percentage, and a .182 wOBA. Those are of course, abysmal offensive numbers but what may be even more impressive is that the expected numbers are even better.