Cumber is an incredibly powerful fighter. In fact, he’s one of the most powerful fighters in all of media just by virtue of being one of the strongest Dragon Ball characters. He’s massively faster than light and his destructive ability is also completely out of this world. Ryoma is not going to be able to do a whole lot against Cumber here…or that’s what it would look like on the surface. He’s a pretty solid tennis player so there’s no way he’s going to lose. He’ll use his racket to block all of Cumber’s attacks and that will be game over. Ryoma wins.
Update 8 7 2020. Fastest update ever but with the high above ruling nullified Ryoma can’t win this round. Cumber wins.