Proud Dad moment for Dwyane Wade on Thursday night ... the NBA legend got to watch his son play in his HS season opener -- and the kid threw down a sick alley-oop!!
The show all went down in front of a sold-out crowd in San Diego ... where Zaire Wade's Sierra Canyon squad beat the hell out of Montgomery HS, 91-44, in its 2019 debut.
Zaire only scored 6 points ... but he made two of them REALLY count -- catching a lob and putting it home, all while Dwyane watched from his courtside seat!