Jake Paul Knocks Nate Robinson Out Cold, Violent KO

Jake Paul just DESTROYED Nate Robinson -- knocking the ex-NBA star out cold with a devastating right cross that sent Nate crashing to the mat.

Wow.

23-year-old Jake was in control the entire fight Saturday night -- knocking Nate down once in the 1st round -- and twice in the 2nd.

But, there was no getting up from knockdown #3 -- Paul hit him with a nuclear bomb right on the button.

36-year-old Nate eventually got up -- but the former NBA star needed some help off the canvas.

Paul only landed 8 punches in the fight ... but he made 'em all count.

Snoop Dogg was announcing the fight and cautioned other athletes looking to get in the boxing game -- "You don't play boxing."

After the fight, Paul praised Nate during a post-fight interview with Jim Gray ... "He was better than I expected ... I wanted to say thank you to Nate."

"It takes a lot of balls to step in the ring and I don't want to take anything away from that."

After the fight, Nate called out Conor McGregor -- telling Jim Gray he wants to stay in boxing for a long, long time.