The Jayhawks (15-2, 2-0 Big 12) nearly fell to an unranked opponent for the third time this season. But ISU shot just 42 percent from the free throw line and was outrebounded 48-32, allowing Kansas to extend its winning streak to nine.
Rush tied the game at 63 on an alley-oop dunk with 1:52 left in OT. He then stripped Mike Taylor on the other end, and his dunk gave Kansas a two-point lead. Corey McIntosh was called for traveling, and Mario Chalmers converted two free throws to put the Jayhawks up by four with 21.9 seconds left.
Taylor's free throw pulled the Cyclones (11-6, 2-1) back within three. ISU put Julian Wright on the line with 5.9 seconds left, and he clinched the win with a free throw.
Taylor finished with 21 points. Johnson added 14 points and 11 rebounds for ISU, posting another double-double.
Kansas trailed much of the second half, but Wright's free throw with 2:17 left tied the game at 53. After Jiri Hubalekj and Kaun traded inside baskets, freshman Dodie Dunson hit a 3-pointer to give ISU a 58-55 lead with 1:11 left. Rush answered with a 3 on the other end, tying the score.
Hubalek then missed inside for ISU, giving Kansas possession with the shot clock off. Chalmers missed a long jumper as time expired.
Rush had 12 points to for the Jayhawks, which fell to Oral Roberts and DePaul in non-conference play.
The Jayhawks opened the second half with a 12-3 run and took a six-point lead. Russell Robinson's three-point play put Kansas ahead, and Kaun and Wright added baskets in the paint that pushed the Jayhawks' lead to 39-33.
Taylor's third triple of the second half put the Cyclones back ahead, 49-46.
Kansas had turned the ball over less than its opponent in every game this season, but ISU forced the Jayhawks into 16 turnovers; seven of which were committed by Wright.
Chalmers had 11 points for Kansas. Wright added eight points and 12 rebounds. ISU next plays at Colorado on Wednesday.
Stay tuned this week for more analysis of this game, men's basketball as a whole, and football recruiting here at Cyclone Nation.