See main article: 2003–04 ULEB Cup.
| width=50 | width=160 align=right | Home Team | width=100 | Score | width=160 align=left | Away Team | width=100 | Venue | width=200 align=left | Date | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Game 1 | 89 - 63 |  Caprabo Lleida | Kozani | February 10, 2004 | |||||||
| Game 2 | Caprabo Lleida | 89 - 58 | Makedonikos | Lleida | February 17, 2004 |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| Game 1 | Wallone Charleroi  | 56 - 74 | Adecco Estudiantes | Charleroi | February 10, 2004 | ||||||
| Game 2 | Adecco Estudiantes | 84 - 91 | Wallone Charleroi | Madrid | February 17, 2004 |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| Game 1 | Real Madrid | 87 - 68 | Auna Gran Canaria | Madrid | February 10, 2004 | ||||||
| Game 2 | Auna Gran Canaria | 63 - 61 | Real Madrid | Las Palmas | February 17, 2004 |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| Game 1 | 81 - 70 |  Metis Varese | Cologne | February 10, 2004 | |||||||
| Game 2 | Metis Varese | 81 - 62 | RheinEnergie Cologne | Varese | February 17, 2004 |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| Game 1 | 68 - 79 | BC Reflex | Ventspils | February 10, 2004 | |||||||
| Game 2 | BC Reflex | 95 - 89 | BK Ventspils | Belgrade | February 17, 2004 |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| Game 1 | DKV Joventut | 78 - 62 | Breil Milano | Badalona | February 10, 2004 | ||||||
| Game 2 | Breil Milano | 81 - 69 | DKV Joventut | Milano | February 17, 2004 |
| width=50 | width=160 align=right | Home Team | width=100 | Score | width=160 align=left | Away Team | width=100 | Venue | width=200 align=left | Date | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Game 1 | Hapoel Jerusalem  | 77 - 67 |  Prokom Trefl Sopot | Jerusalem | February 10, 2004 | ||||||
| Game 2 | Prokom Trefl Sopot | 86 - 82 | Hapoel Jerusalem | Sopot | February 17, 2004 |
| width=50 | width=160 align=right | Home Team | width=100 | Score | width=160 align=left | Away Team | width=100 | Venue | width=200 align=left | Date | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Game 1 | 77 - 80 |  Lietuvos Rytas | Sofia | February 10, 2004 | |||||||
| Game 1 | Lietuvos Rytas | 105 - 78 | Lukoil Academic | Vilnius | February 17, 2004 |