It is a poorly kept secret that Reds closer Aroldis Chapman throws very hard. After all, he's unofficial owner of the fastest pitch ever recorded ...

And he regularly hits triple digits with his four-seamer.

Regarding that latter merit, here's Darren Willman, proprietor of the most excellent Baseball Savant ... 

Here's the list of contenders for highest average fastball in the Pitchfx era (i.e., since 2006 or so). In matters related, the slowest fastball Chapman has uncorked this season checked in at 95 mph. So, yes, he's hasty on an unprecedented scale.

It's no coincidence that Chapman this season has struck out an astounding 51.8 percent of batters faced. It's also no coincidence that he's one of the best closers in baseball.