Davis cornered Ruiz in the opening round, unloading landing a straight left and following up with a right hand that sent Ruiz to the canvas.
With Davis being active only this weekend when taking out a world-rated star like Hugo Ruiz in one round, it doesn't bode well for Tenshin when the pair eventually collide in the spring.
Davis only took a couple meaningful punches, otherwise using his superior skill, size and especially power to make Ruiz skittish. He took a step back and dropped to a knee. When Ruiz got up, he staggered and was in no condition to continue. That led Reiss to call it off.
Elsewhere, Ruiz's compatriot Rey Vargas successfully defended his WBC world super-bantamweight title against Venezuela's Franklin Manzanilla, while Alberto Machado of Puerto Rico lost his WBA secondary super-featherweight belt to American Andrew Cancio. He originally weighed in a quarter-pound over.
Ruiz feels he is fit and in shape ready to go again with just under a month since his last fight.
During a scrum with reporters after the fight, Mayweather, with Davis at his side, said that the 24-year-old Baltimore fighter would head to Japan to face Nasukawa in a boxing exhibition this spring.
"My main goal tonight was to make a great performance, which I did". He said afterward he wants to fight at least three more times this year. Ruiz didn't like those and it never got any better.
Saturday night's outfit was not the first sign of fandom Davis has publicly shown for Jackson.
Davis will likely return to less farcical match-ups in May when he will defend his title against an opponent that, as of yet, remains unselected.