GREENSBORO, N.C. — North Carolina coach Roy Williams says there's a "huge probability" point guard Ty Lawson won't play in the Tar Heels' NCAA tournament opener Thursday.

Lawson was able to participate in some practice drills Tuesday and Wednesday, but Williams said he wants to see more from the Atlantic Coast Conference player of the year before he returns to the lineup from a toe injury.

Lawson jammed his right big toe before the regular-season finale against Duke and missed the Tar Heels' two ACC tournament games in Atlanta last weekend. North Carolina begins its NCAA run Thursday against Radford in the South Regional.

Lawson says he's mainly battling stiffness in the toe that makes it difficult for him to cut in different directions.