Fellow rookie Zion Williamson had 20 points for the Blue Devils, who led 41-32 at halftime but hit their first six shots after the break to finally stretch out the lead. Duke (9-1) shot 57 percent after halftime and 49 percent overall for its fourth straight win.
It was Barrett’s second 30-point outing this season for the Blue Devils, who put up another big offensive total despite making just 5 of 21 3-pointers.
Duke also got a scare when freshman point guard Tre Jones came up limping with an apparent left leg injury, which sidelined him for nearly all of the final 14 minutes.
Yale: The Bulldogs already had two power-conference wins, first by beating California in the Pac-12 China game to open the season and then by beating Miami on Dec. 1. But they couldn’t add another win to that total despite hanging within reach throughout the first half. Yale shot just 35 percent and finished with 23 turnovers that the Blue Devils converted into 24 points.
Duke: The Blue Devils head into an extended exam break off yet another lopsided win. They had their only true tests in the Maui Invitational, where they beat No. 8 Auburn by six before losing to now-No. 1 Gonzaga in the title game. Otherwise, they haven’t played a game closer than 21 points, including that dazzling opening-night romp against Kentucky.
Yale: The Bulldogs host Albany on Tuesday.
Duke: The Blue Devils host Princeton on Dec. 18.