The Cowboys (9-2) were trailing 49-45 when Nance scored and Grabau followed with two free throws on the next possession to tie the game with 8 minutes left. Grabau then turned a turnover into a 3-pointer.
After the Bobcats (3-6) tied it, Grabau had a three-point play and Nance made two free throws to make it 58-53 with 5:25 left. From there, Wyoming made 8 of 10 free throws to pull away.
Derek Cook added 15 points for Wyoming, which shot 56.8 percent from the field (21-37) and 26 of 34 from the foul line.