Mares would've given us some indication of whether Davis is the real deal or not.
Davis improved to a mark of 21-0 with 20 wins by knockout as he defeated Ruiz at just 2:59 of the opening round.
The originally scheduled opponent for Davis was former multiple division world champion Abner Mares, but he had to pull out of the fight due to a detached retina suffered in training camp that required surgery.
It was an impressive though expected win for Davis, who needed two attempts Friday to hit the 130-pound super featherweight limit.
Davis beat Ruiz by first-round technical knockout after dropping the Mexican veteran with a right cross.
And it appears Mayweather is setting up another exhibition bout for Nasukawa. The bout caught some heat from fans and pundits as being boring, but it was a bout in which both fighters had a lot to lose with a loss, neither is young and they have both lost, meaning the loser of this bout, really had to consider what to do after this bout. He got an exhibition bout with the guy Tenshin in Japan, in April.
"I'm proud of Tank, and he's gonna stay active", Mayweather said. Mayweather won the fight with a lopsided first-round knockout.
He stopped the Japanese star inside the very first round after knocking him down three times.
Gervonta Davis' famous promoter stood by his side late Saturday night in a crowded hallway near Davis' locker room.
Fresh from beating Tenshin up himself on New Year's Eve, Mayweather plans to send over Gervonta Davis to potentially do a similar job on a RIZIN Promotions show.
Premier Boxing Champions: Gervonta "Tank" Davis vs. Hugo Ruiz takes place at the Dignity Health Sports Park in Carson, California on February 9, 2019 at 10 p.m. ET/7 p.m. PT on SHOWTIME.