Mankin quickly took advantage, grabbing a defensive rebound on his first possession on the floor and then hitting a 3-pointer at the other end.
It was Mankin's first field goal of the season.
“We need to get Austin in that rotation a little bit more,” Kruger said. “Especially with Je'lon (Hornbeak) out. We need one more guy to get into that rotation.”
The Sooners (11-1) are off for more than a week before hosting Louisiana Tech at 7 p.m. Dec. 30.
The Bulldogs, who lost to Oklahoma State 70-55 on Dec. 14, are 9-3 entering Sunday's game against Louisiana-Monroe.
OU's game against Louisiana Tech will be its final nonconference game before beginning Big 12 play at Texas on Jan. 4.