Ku sii wad qodobkan - Walker wuxuu markii ugu horreysay u tartamay Gibraltar 2000 IAAF World Cross Country Championships
Vilamoura, Portugal halkaas oo uu kaalinta 158aad ka galay tartanka ragga da'da weyn ee waqtigiisu ahaa 46:48 wuxuuna dhammeeyay kaalinta 149aad ee tartanka gaagaaban ee ragga waqtigiisu ahaa 14:15. Sannadkii xigay ee Ciyaaraha Jasiiradda ee 2001 ee Isle of Man, Walker wuxuu ku dhammeeyay kaalinta 4aad tartanka ragga ee triathlon shaqsiyeed isaga oo leh waqti 2:06:30. Isla kulankaas, Walker wuxuu sidoo kale diiwaan geliyey waqtigii ugu fiicnaa ee shaqsiyeed iyo waqtigii qaranka ee ahaa 10:34.95 ee finalka 3000 m steeplechase. Bishii Luulyo 2002, Walker wuxuu markii ugu horreysay ka qeyb galay ciyaaraha Barwaaqo Sooranka isagoo ku tartamay tartanka ragga ee triathlon-ka ciyaaraha Manchester 2002. Wuxuu ku dhammeeyay koorsada 2:06:15.19 wuxuuna galay kaalinta 26-aad. Saddex bilood ka dib, Walker wuxuu ku tartamay 2002 Ironman World Championship ee Hawaii. Wuxuu dhammeeyey 160-aad 280-kii ee 35<unk>39 qaybta da'da iyo 767-aad 1605-kii guud ahaan isagoo leh waqti dhan 11:22:55. Ciyaarihii Jasiiradda ee 2003 ee Guernsey, Walker wuxuu ku guuleystay dahabka ragga triathlon shaqsi ahaaneed iyo Harvey Gurry iyo Anthony Perera oo ku dhammaaday kaalinta 6aad ee tartanka kooxda.