Duke defeated St. Joseph's so thoroughly in Philadelphia last night, 87-66, that the third-ranked Blue Devils dazzled their own coach.

"I'm kind of bewildered as to how well we played in the second half against a real good team," Mike Krzyzewski said. "We had a terrific second half, dynamite basketball, and I'm not a guy to overly praise my team . . . This is my best team."

Duke (15-0) led by only 41-39 at the half, sped to 50-39, then after St. Joseph's closed to 63-57, put the Hawks (9-3) away with a 22-2 run.

Mark Alarie had 22 points and Johnny Dawkins 21 for Duke; point guard Tommy Amaker 10 assists, five steals and just one turnover. BYU 80, Notre Dame 76

Tom Gneiting scored seven of his 18 points in overtime to boost Brigham Young (6-9) over the 16th-ranked Fighting Irish (9-2) in Provo, Utah. For Notre Dame, David Rivers had 28 points, eight in overtime. Villanova 68, Connecticut 59

In Hartford, freshmen Doug West and Ken Wilson scored 16 and 15 points and the Wildcats' zone defenses frustrated their Big East opponent. Villanova is 11-7, 3-1; Connecticut 9-4, 1-3. LSU 86, Mississippi 68

John Williams scored 21 in a Southeastern Conference romp in Baton Rouge for the No. 8 Tigers (15-2, 2-2). Louisville 59, Southern Miss. 54

Jeff Hall made a 20-foot jumper to break a 54-all tie with 1:21 remaining in Hattiesburg, helping No. 17 Louisville (9-4) even its Metro Conference record at 1-1. W. Virginia 63, Penn St. 53

Dale Blaney furnished 12 points and freshman Darryl Prue of Washington, D.C., 11 points and eight rebounds as a substitute, helping WVU (9-5) reach 5-0 in the Atlantic 10 and lower the home team to 7-7, 2-4. Bradley 79, Dayton 77

The No. 19 Braves (16-1) won on the road as Hersey Hawkins scored 25 points and Jim Les 24. Regulation ended 69-69 after Damon Goodwin (28 points) hit a jumper to put the Flyers ahead with :03 left but Hawkins took the inbound pass after time out and, at :01, made a six-foot shot. UAB 77, S. Alabama 64: No. 14 Alabama-Birmingham, at home, got 24 and 23 points, respectively, from seniors Jerome Mincy and Steve Mitchell. The Blazers are 16-2, 3-0 in the Sun Belt Conference; the Jaguars 12-6, 1-1. VCU 72, James Madison 51

In Richmond, Alvin Robinson came on in relief for 12 points, 11 rebounds and three blocked shots to lead Virginia Commonwealth. Both teams are 3-9.