Siva connected on 7-of-11 shots from the floor to help pick up the slack as leading scorer Russ Smith was held to just eight points for the Cardinals (15-1, 3-0 Big East).
Chane Behanan (12 rebounds) and Gorgui Dieng (12 points, 16 boards) led the defensive effort for the victors, who outrebounded their opponents 49-24 and limited them to 27 percent shooting.
Victor Rudd paced the Bulls (9-6, 0-3) with 10 points.
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