Mariano Rivera hit an inside-the-park home run at his first Yankees' Old-Timers' Day

When you're the best, you're the best.

Mariano Rivera, all-time Yankees great and unanimous first-ballot Hall of Famer, accomplished a great deal during his playing days, but he hadn't yet appeared in a Yankees' Old-Timers' Day until Sunday. And in his first appearance at the annual reunion event, he put on quite a show.

Flashing back to his playing days of frustrating hitters with his suffocating cutter, here's Mo getting Paul O'Neill on a comebacker for a double play:

But this next clip is the stuff of legend. The stuff you like to see, the stuff the fans go crazy for.

Here's Mariano Rivera, legendary relief pitcher who never picked up a base hit in his career at the plate (in four official plate appearances) ripping an inside-the-park homer to right-center:

We all knew this already, but it's clearly Mo's world. We're just living in it.