Kammala wannan jumla: Deicmans ya cancanci shiga wasanni biyu na iyo a Wasannin Olympics na bazara na 2004 a Athens, ta hanyar haskakawa FINA B-daidaitaccen shigarwar lokaci na 2:03.77 (200 m medley na mutum) daga Gasar Cin Kofin Duniya ta FINA a Barcelona da 4:28.44 (400 m medley na mutum) daga
Gasar Zakarun Turai a Madrid. A cikin tseren tseren mita 400, Deicmans ya taɓa Philippines 'Miguel Molina don karya shingen 4:30 kuma ya kama wuri na bakwai a zafin na biyu da dakika hudu, a cikin lokaci na 4:29.17. A tseren tseren mita 200 na mutum, Deicmans ya kalubalanci wasu masu iyo bakwai a zagayen na huɗu, gami da 'yan wasan Olympics biyu Jeremy Knowles na Bahamas da Ioannis Kokkodis na Girka. Ya hau zuwa matsayi na biyar da 0.39 na biyu a bayan Bradley Ally na Barbados, ya karya rikodin Latvia na 2:03.68. Deicmans ya kasa ci gaba zuwa wasan kusa da na karshe, yayin da ya sanya na ashirin da biyar a gaba ɗaya a cikin wasan farko.