Rubuta ci gaba don wannan sakin layi - A Wasannin Olympics na bazara na 2004 a Athens, Alleyne ya ci gaba da shirinsa ta hanyar cancanta ga wasanni biyu na iyo. Ya share FINA B-misali shigarwa sau na 51.89 (100 m freestyle) da kuma 1:53.19 (200 m freestyle) daga Pan American Games a Santo Domingo, Jamhuriyar Dominica. A cikin mita 200 na 'yanci, Alleyne ya kalubalanci wasu masu iyo bakwai a zagayen na uku, gami da' yan wasansa biyu na Olympics Joshua Ilika Brenner na Mexico da Giancarlo Zolezzi na Chile. Ya shawo kan Mahrez Mebarek na Algeria don ɗaukar matsayi na uku da na talatin da huɗu gaba ɗaya da 0.11 na biyu a cikin 1: 52.89. A gasarsa ta biyu, mita 100 na 'yanci
, Alleyne ya sanya na arba'in da takwas a gaba ɗaya a farkon safiya. Yin iyo a zagaye na uku, Alleyne ya dace da lokacin shigarsa na 51.89 don adana matsayi na biyar a kan ɗan ƙasar Zolezzi Max Schnettler ta 0.02 na biyu.