Davis got the knockout by landing a devastating right hook to the nose of Ruiz causing him to fall to his knees and enough blood the referee stepped in to stop the fight.
Davis' promoter Floyd Mayweather was sat ringside and observed the 24-year-old extend his record to 21-0-20KOs.
Junior lightweight world titleholder Gervonta "Tank" Davis could be back in the ring as soon as April - but not for an official fight.
Floyd Mayweather made sure everyone jammed into this tiny space received the same message - if there's one fighter in boxing that can surpass his superstar status, it's Davis. Yes he's fighting Tenshin in an exhibition bout in Japan'.
'Yes, exhibition bout. April is Tenshin and May is the real fight, ' he added.
"I'm proud of Tank, and he's gonna stay active", Mayweather said. Mayweather won the fight with a lopsided first-round knockout.
After the fight, Davis said he wanted to get more rounds in, but knew with a quick victory, he would be able to return to the ring sooner.
The fight itself was half the story as the over 8,000 people in attendance, mostly came for Davis whether to cheer or boo, they were invested in his fight. Then Mayweather, 41, returned 16 months later for the exhibition with the 20-year-old Nasukawa, who had no experience as a boxer despite his success as a kickboxer.
"We're talking about May [for Davis' next fight], if that's okay with him".
Mayweather said that he earned $9 million - plus a $1 million bonus - for the exhibition with Nasukawa and said he would likely participate in future exhibition fights.
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