GREENSBORO, N.C. — The Clemson Tigers began attacking the hole, then charged into the ACC Tournament quarterfinals.Struggling from 3-point range, the eighth-seeded Tigers used strong drives and 18-of-19 shooting from the free-throw line — all of those coming in the second half — to defeat ninth-seeded Miami 69-64 on Wednesday.Al-Amir Dawes scored 18 points, Aamir Simms added 14 points and 10 rebounds and John Newman had 11 points for Clemson, which avenged an overtime loss to