Buuxi weedha soo socota: De Beck wuxuu u jeestay wadada 1983 wuxuuna ku guuleystay horyaalkii saddexaad (iyo kii ugu dambeeyay) ee reer Belgium ee xirfadiisa isagoo ku ordaya 29:42.56 daqiiqo 10,000 mitir. Sanadkii ugu dambeeyay ee tartankiisa waa weyn wuxuu yimid 1987: wuxuu ku dhammeystay kaalinta 73aad ee tartanka.
1987 IAAF World Cross Country Championships waxayna ku guuleysatay Zwijndrecht Marathon waqti dhan 2:21:50 saacadood.