Dwayne Evans added 17 points for the Billikens, who won for the fourth time this season against a Top 25 opponent – a school record – and earned their ninth victory in a row in Atlantic 10 play. The previous eight had all been by 10 points or more.
Saint Louis (21-5, 10-2) remains firmly in control in the conference, holding a one-game lead over No. 24 Virginia Commonwealth.
Kellen Dunham led Butler (22-6, 9-4) with 14 points, all in the first half. Rotnei Clarke and Roosevelt Jones each scored 13 for the Bulldogs, who went 9 of 25 from the floor in the second half.
The Billikens also denied Butler coach Brad Stevens the opportunity to move within one victory of tying for the most wins in a coach’s first six seasons.
Stevens is 161-46, tied with North Carolina State’s Everett Case. Pittsburgh’s Jamie Dixon was 163-45 in his first six seasons with the Panthers.
NO. 5 DUKE 61,
NO. 19 FLORIDA STATE 50
In Durham, N.C., Elizabeth Williams had 20 points and 13 rebounds to help Duke (25-1, 15-0 Atlantic Coast Conference) beat Florida State (20-6, 10-5).
Chloe Wells added 15 points for the Blue Devils, who won their 37th consecutive home game against ACC competition.
Alexa Deluzio scored 16 points to lead Florida State, which lost its sixth consecutive matchup with Duke.
NO. 16 NORTH CAROLINA 72
VIRGINIA TECH 50
In Blacksburg, Va., Tierra Ruffin-Pratt scored 17 points to lead North Carolina (24-4, 12-3 ACC) past Virginia Tech (8-18, 2-13).
Xylina McDaniel added 13 and Krista Gross had 11 for the Tar Heels.