Robert Griffin III impressed NBA star LeBron James. (Associated Press)

Dallas Cowboys fans watched on Thursday with a mix of agony and admiration as Redskins quarterback Robert Griffin III led his team to an upset victory at Cowboys Stadium in the first nationally-televised game of his career.

One of the more famous Cowboys fans, Miami Heat forward LeBron James, couldn’t help but express his respect for Griffin, who threw for 311 yards and four touchdowns. After the game, James tweeted: “RGIII is a MONSTER!!”

My colleague Michael Lee was down in Miami on Friday, and was part of a media scrum in which James was asked about Griffin’s play against Dallas.

“I tweeted he’s a monster yesterday. I hated it had to be against the Cowboys, but I give props where props is due. He’s an animal,” James said. “He’s the first rookie to ever win in Cowboys Stadium on Turkey Day, but the passes he was making, honestly – the unbelievable pass to Santana Moss on the roll-out on the back shoulder, and over the middle to Pierre Garcon. He was making some unbelievable plays. He’s an unbelievable talent.

Asked if Griffin had converted to the Redskins, James said, “No,” and walked away.