Oscar De La Hoya Predicts Long Run For Andy Ruiz As Champ, 'He's The Man'

Andy Ruiz will be known for WAY MORE than just beating Anthony Joshua ... so says Oscar De La Hoya, who tells TMZ Sports AR is going to have a long run as champ!!!

"Imagine all the confidence he has now," De La Hoya says.

Ruiz shocked the world on Saturday night when he knocked down Joshua FOUR times and made the heavyweight champ quit in the 7th-round.

But, some have already pegged Ruiz as the next Buster Douglas -- as in a 1-fight wonder ... and not the next big thing in boxing.

Enter De La Hoya ... who told us out at his foundation's 19th annual Golf Classic on Monday that he sees things way differently, saying Ruiz will put together a nice run as the new champ from here.

"Ruiz is the man, now, man," De La Hoya says ... "He's the man."

Of course, the Golden Boy is biased -- he has Mexican bloodlines and tells us he was rooting like hell for Ruiz in the fight!!!