Ka kammala wannan magana: Sa'ad da ƙasarsu Girka ta karbi bakuncin wasannin Olympics na shekara ta 2004 a Athens, Matsa ta yi wasan ta na farko a wasannin Olympics sa'ad da take 'yar shekara 17, ta yi gasa a wasanni biyu na iyo. Ta buga FINA B-misali na 25.61 (50 m freestyle) daga taron gwaji na Olympics a Cibiyar Wasannin Ruwa na Athens. A ranar farko ta wasannin, Matsa ta haɗu da Nery Mantey Niangkouara, Eleni Kosti, da Zoi Dimoschaki a tseren tseren mita 4 × 100 na 'yanci. Ta ɗauki alhakin tashin jirgi da wuri, lokacin da aka cire Girkawa daga zafin jiki. Kusan mako guda daga baya, a cikin
50 m freestyle, Matsa ya sanya talatin da uku a farkon safiya. Ta yi iyo a cikin zagayen bakwai, ta shawo kan Sharntelle McLean na Trinidad da Tobago don ɗaukar matsayi na bakwai da kashi huɗu cikin goma na biyu (0.40) a cikin 26.46.