Ku dhammee weedhan soo socota: Alleyne wuxuu ku guuleystay labo tartan oo dabaasha ah ciyaarihii Olombikada ee 2004 ee Athens. Wuxuu ka saxiixay FINA B-ta caadiga ah ee 51.89 (100 m freestyle) iyo 1:53.19 (200 m freestyle) ee Ciyaaraha Pan American ee Santo Domingo, Dominican Republic. 200 m oo qaab xor ah, Alleyne waxay la tartantay toddobo dabaasha kale oo ku jiray heerkulka saddexaad, oo ay ku jiraan laba jeer oo kale oo Olombikada ah Joshua Ilika Brenner oo reer Mexico ah iyo Giancarlo Zolezzi oo reer Chile ah. Wuxuu ka adkaaday Mahrez Mebarek oo reer Algeria ah si uu u helo kaalinta saddexaad iyo soddon iyo afaraad guud ahaan 0.11 ilbiriqsi 1:52.89. Markii labaad ee uu tartanka galay,
100 m oo qaab xor ah, Alleyne ayaa kaalinta afartan iyo sideedaad ka gashay isreebreebka subaxnimadii. Dabaasha heerkulka saddexaad, Alleyne wuxuu la jaanqaaday waqtigiisii gelitaanka ee 51.89 si uu u badbaadiyo booska shanaad ee ka sarreeya Max Schnettler oo ka tirsan Zolezzi oo ah 0.02 ilbiriqsi.