Floyd Mayweather‘s middle-of-the-night workout ways haven’t changed after retirement … he’s just winging jumpshots instead of punches!

The 50-0 boxing legend pulled up to The Gem of Las Vegas — a 24-hour indoor basketball spot — in Sin City around 2 AM… to hoop with the fellas, and TMZ Sports has video of the pickup games.

Mayweather, 49, looked good on the court … scoring a couple buckets in the paint!

Floyd and the guys played for hours … ending sometime around 5 AM, and we’re told everyone had a blast playing with the boxing legend.

Of course, Money’s a big-time basketball fan who is routinely seen sitting courtside at some of the biggest NBA games.

He’s also hooped in a bunch of celeb games over the years, and he almost always held his own on the hardwood with the other stars (that Bone Collector crossover wasn’t fair!).