Dunn became only the second Baylor player to surpass 2,000 points for a career, while Quincy Acy added 15 points and a game-high eight rebounds for the Bears (12-3, 2-0 Big 12).
Baylor broke the Ferrell Center record it shared with Oklahoma. The Sooners were 14-0 on the Bears' home court and 26-0 against them in Big 12 play before Baylor swept the series last year.
Dunn scored on a drive with 17:07 left to crack the 2,000-point barrier. The senior has 2,009 points, leaving him 180 behind Terry Teagle on the school's all-time list and 247 behind all-time Big 12 leader Andre Emmett of Texas Tech.