Tenshin Nasukawa Says He'll Fight Floyd Mayweather Better Than Conor McGregor

Tenshin Nasukawa has touched down in Las Vegas -- and put on an impressive workout at Floyd Mayweather's private boxing gym ... where he told us he'll do better in the ring against Floyd than Conor McGregor!!!

The 20-year-old kickboxer looked lightning fast, strong and scary athletic when he showed off his skills in the ring ... and then humbly told reporters he's just hoping to land a shot on Floyd.

But, let's get serious ... dude looks good. He looks hungry. And, Floyd could be in real trouble.

Of course, Floyd and Tenshin are set to throw down in Japan on New Year's Eve in a 3-round exhibition as part of the RIZIN 14 event at the Saitama Super Arena just outside of Tokyo.

Tenshin is a stud kickboxer in Asia -- racking up a 27-0 record in his impressive young career. He looks fast and strong but the big question ... will he be able to connect with one of the greatest defensive fighters of all time?

The workout is expected to begin around 3 PM PT -- and with all Mayweather events, ya never really know what craziness could be in store.