Eighth-final 1
Home teamScoreAway teamVenueDateGame 1Makedonikos 89 - 63 Caprabo LleidaKozaniFebruary 10, 2004Game 2Caprabo Lleida 89 - 58 MakedonikosLleidaFebruary 17, 2004
Eighth-final 2
Home teamScoreAway teamVenueDateGame 1Wallone Charleroi 56 - 74 Adecco EstudiantesCharleroiFebruary 10, 2004Game 2Adecco Estudiantes 84 - 91 Wallone CharleroiMadridFebruary 17, 2004
Eighth-final 3
Home teamScoreAway teamVenueDateGame 1Real Madrid 87 - 68 Auna Gran CanariaMadridFebruary 10, 2004Game 2Auna Gran Canaria 63 - 61 Real MadridLas PalmasFebruary 17, 2004
Eighth-final 4
Home teamScoreAway teamVenueDateGame 1RheinEnergie Cologne 81 - 70 Metis VareseCologneFebruary 10, 2004Game 2Metis Varese 81 - 62 RheinEnergie CologneVareseFebruary 17, 2004
Eighth-final 5
Home teamScoreAway teamVenueDateGame 1BK Ventspils 68 - 79 BC ReflexVentspilsFebruary 10, 2004Game 2BC Reflex 95 - 89 BK VentspilsBelgradeFebruary 17, 2004
Eighth-final 6
Home teamScoreAway teamVenueDateGame 1DKV Joventut 78 - 62 Breil MilanoBadalonaFebruary 10, 2004Game 2Breil Milano 81 - 69 DKV JoventutMilanFebruary 17, 2004
Eighth-final 7
Home teamScoreAway teamVenueDateGame 1Hapoel Jerusalem 77 - 67 Prokom Trefl SopotJerusalemFebruary 10, 2004Game 2Prokom Trefl Sopot 86 - 82 Hapoel JerusalemSopotFebruary 17, 2004
Eighth-final 8
Home teamScoreAway teamVenueDateGame 1Lukoil Academic 77 - 80 Lietuvos RytasSofiaFebruary 10, 2004Game 1Lietuvos Rytas 105 - 78 Lukoil AcademicVilniusFebruary 17, 2004