Tennis couple MARTINA HINGIS and RADEK STEPANEK have called off their nine month engagement. The Swiss player, 26, and Czech tennis ace, 28, announced their plans to marry last January (07) after becoming engaged the month before (Dec06). A spokesman for the Association of Tennis Professionals says, "Radek asked me to pass on a message announcing that he and Martina Hingis have split up, they will remain good friends, and that is all I have to say."