And ya know who predicted this way back in November?! None other than Melo's dad, LaVar ... who told TMZ Sports it was "GUARANTEED!!!" to happen.

Now, before we give him the title of "LaVarstradamus," it wasn't that bold of a prediction to begin with -- Melo was the #3 overall pick and the expectations were high from the very beginning.

19-year-old Ball managed to average nearly 16 points, 6 rebounds and 6 assists in 51 games as a rook ... and still held on to get the top honors despite missing a chunk of the season with a wrist injury.

There will almost certainly be some folks pissed with the results -- Minnesota Timberwolves #1 pick Anthony Edwards had a stellar rookie campaign, earning just over 19 points, 4.7 rebounds and nearly 3 assists per game.

The decision is made by a list of sportswriters and broadcasters who vote for the top 3 rookies of the season -- first place votes get 5 points, second gets 3 points and third gets 1.

Whoever gets the highest point total of votes wins the award ... no matter which player has the most first place votes.