Jalen Green is PISSED he didn't go #1 overall in the NBA Draft ... saying he has a "super big" chip on his shoulder for getting passed on -- and he took it all out on the Pistons by dropping 25 points!!
The Houston Rockets' #2 pick faced off against Cade Cunningham and the Detroit Pistons for the first time in their careers at Summer League in Vegas on Tuesday ... and it didn't disappoint.
Green outdueled the top pick with 25 points, 5 rebounds, 3 assists and 1 steal in the 111-91 win .