Rubuta ci gaba don wannan sakin layi - Lokacin da kasarsa ta Girka ta karbi bakuncin wasannin Olympics na bazara a Athens a shekarar 2004, Matsa ta fara gasar Olympics a matsayin 'yar shekara 17, tana fafatawa 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 bayan haka, a tseren mita 50 na 'yanci
, Matsa ya sanya talatin da uku a cikin safiya na farko. 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.