The Celtics pulled the ultimate shocker over the Cavaliers Sunday when they rallied in Game 3 for a 111-108 victory.

The Cavs were none too pleased, especially J.R. Smith, who said star LeBron James wasn't aggressive or confident enough during that game.

James was quick to shut down any residual feelings about his tepid performance as Cleveland practiced ahead of Tuesday's Game 4.

"Past it," James said, via ESPN.com. "I'm focused on Game 4. We know what we did wrong in Game 3. We know ways we can get better. I'm focused on the present, not the past."

James finished with just 11 points and didn't score at all in the final 16 minutes of the game as Boston pushed back from a 21-point deficit to move the series to 2-1. Since Boston was without Isaiah Thomas due to a hip injury, the Cavaliers should have been able to keep the mojo going and dispatch the Celtics with ease.

“He’s got to be aggressive, get downhill, play like he’s been playing, play confident,” Smith said Monday after practice. “That’s what I always think, (with) people of his stature or people like him, you’ve got to play confident the whole night and play aggressive. It’s the Eastern Conference finals. It’s not enough for him. For what he does, what he brings, it’s not enough. He knows that. We know that. Just expect him to be better in Game 4.”

According to James, watching the Game 3 film was awful because he could see how their momentum changed in the second half.

"We had opportunities," James said. "It is what it is. They played a helluva game and they took it to us and we weren't able to stop the runs that they made, the momentum that they [built]. Some of the plays that we made, some of the plays that I made, I was like, 'What are we doing?' or 'What could I have done better?' But you figure out the next game and go forward."