The Game -- NO SPORTSMAN BEHAVIOUR!

Well, that didn't take long -- one week after The Game got Mike Tyson tatted on his hand ... he allegedly decked someone so hard during a basketball game ... police were called to the scene.
Law enforcement sources tell TMZ ... Game was playing in a Pro-Am
game Sunday at Hollywood High School when he got into a heated argument
with another player. We're told Game threatened to kill the guy, punched
him in the face and took off.

Officers responded and the alleged victim filed a report. Police are investigating the incident as a battery.

We've reached out to Game ... no word back. Ditto for Tyson.

 | TMZ.com