Boxing's Bob Arum Says Hillary Knocked Out Trump!

Legendary boxing promoter Bob Arum ain't going to the scorecards -- he saw the debate as a TOTAL KNOCKOUT for Hillary Clinton.

Arum -- who worked with Muhammad Ali, Pacquiao, De La Hoya and more -- was excited about Hillary's performance while arriving to Craig's Monday night ... claiming Clinton smoked Trump.

"She showed what a phony he is," Arum said ... "She was brilliant, she's gonna make a great president."

Then again, Arum hates Trump so much -- he challenged him to a FIGHT earlier this year.