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.
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