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 .