CHARLOTTE, N.C. — For the first time since his left sneaker split open 30 seconds after tipoff of a game last month, the Duke superstar Zion Williamson took the court on Thursday night, helping his team to an 84-72 victory over Syracuse in the quarterfinals of the Atlantic Coast Conference tournament.

Showing no signs of the knee injury sustained when his shoe exploded, Williamson dominated the game, scoring 29 points as he made all 13 of his shots from the field. He also had 14 rebounds, five steals and a block.

“I come ready to kill every game,” Williamson told ESPN after the game.

He continued with this theme later in a news conference and dismissed suggestions, which arose after the injury, that he might not return to the Duke lineup and would instead rehabilitate his knee and just prepare for the N.B.A. draft in June.

“Everybody has their right to their own opinion,” he said, “but I knew I was coming back the whole time.”