Cubic Cd2Ru2O7 was prepared hydrothermally at 700 degrees C under 3 kbars pressure. Refinement of single crystal X-ray diffraction data verified the pyrochlore structure with a cell edge of 10.129(1) and a Ru-O distance of 1.927(1). Magnetic, DSC, electrical, and X-ray data indicate a transition at about 100 K that is electronic without any detectable structural change.