In Trevor Bauer's debut, Thursday night against the Braves, he threw fastballs. He threw sliders. He threw curveballs. He threw a few change-ups. He also threw a few (and pay attention because here's where it gets interesting) ...

reverse sliders.

What's a reverse slider? The ever-helpful Carson Cistulli's got a .gif for your viewing pleasure. Sure, some might call that a change-up. But it sure doesn't look like a change-up, and Bauer called them reverse sliders.