COLUMBIA, S.C. — Zion Williamson took on 7-foot-6 Tacko Fall at the end and won, and top-seeded Duke survived when two last-ditch shots by UCF rolled off the rim. Aubrey Dawkins finished with 32 points, but his tip-in try just missed Sunday, and Duke advanced with a 77-76 victory to reach the Sweet 16. Williamson had 32 points, including a layup over Fall with 14.4 seconds left anhis team trailing 76-73.