Giannis Antetokounmpo went nuts on the court Wednesday night, dropping a career-high 64 points -- and then he went ballistic off of it, losing his mind after the Pacers wouldn't give him the game ball from the evening.
The scene was wild ... the Bucks superstar thought he was entitled to the basketball due to his historic performance in the 140-126 victory in Wisconsin -- but Indiana players felt their rookie, Oscar Tshiebwe, should get it for scoring his first-ever NBA points.
Giannis was so incensed that the Pacers wouldn't hand it over -- he actually ran down one of the Fiserv Forum tunnels to insist that his opponents give it back.