MATSUDO, Japan - To Floyd Mayweather, his three-round match on New Year's Eve in Japan is for entertainment only.

To opponent Tenshin Nasukawa, the "exhibition" is as serious as a kick to the head.

Which is what he wishes he could do to Mayweather.

But the rules of their match prohibit the unheralded kickboxer from kicking. So he's taken a crash course in boxing. Among his advisers was three-weight world champion Jorge Linares.

"I can change the world with my fist," Nasukawa said in his quiet voice on Tuesday after a demonstration workout at his family's Teppen Gym in the Tokyo suburb of Matsudo.

Except, he really can't change the world. There will be no judges and no official result.