Atlanta ? Jason Richardson bounced the ball off Carlos Boozer’s forehead, then buried a three-pointer before the clock ran out.

Finally, a little competitiveness broke out in the rookie-sophomore game.

Richardson, a second-year guard with the Golden State Warriors, scored 31 points, but angered Boozer with the closing act in the sophomores’ 132-112 victory over the rookies to kick off All-Star Saturday.

“He has no class, man,” said Boozer, who plays for the Cleveland Cavaliers.

Richardson’s Golden State teammate, Gilbert Arenas, scored 30 points and was named MVP as the sophomores dominated the second half of a game — using that term loosely — that barely passed for basketball.

There were plenty of schoolyard moves, a plethora of sloppy passes and hardly any defense at all.

Arenas, who scored 23 points in the second half, was picked as the top player. But it was Richardson who provided most of the game’s signature moments.

In the first half, he got a head start on defending his dunk championship later in the evening with a couple of jaw-dropping moves.

He made a 360-degree spin on his way to a one-handed slam and followed that with a reverse two-hander that left the backboard shaking and crowd “oohing” and “aahing.”

“Fans come out to see some spectacular plays,” Richardson said. “When I got in the game, I tried to give them some.”

He wasn’t through. With the clock winding down and the game in hand, Richardson dribbled leisurely outside the three-point arc before a quick flip off Boozer’s head. As if playing with a yo-yo, the ball bounced straight back to Richardson, who swished the shot for the game’s final points.

“Fans love stuff like that,” Richardson said. “No disrespect to Carlos. I’ve known him a long time.”

Afterward, the two players embraced, as if there were no hard feelings, but Boozer made it clear that he didn’t appreciate Richardson’s final move.

“He was just trying to get the crowd hyped up, but he has no class,” Boozer said. “You don’t do that.”