See main article: Euroleague 2009–10. Results for Quarterfinals of the 2009–10 Euroleague basketball tournament.
The quarterfinals will be played from March 23 to April 7, 2010. Team #1 (i.e., the group winner in each series) will host Games 1 and 2, plus Game 5 if necessary. Team #2 will host Game 3, plus Game 4 if necessary.
| width=15 | width=220 | Team #1 | width=40 | Agg. | width=220 | Team #2 | width=70 | Game 1 | width=70 | Game 2 | width=70 | Game 3 | width=70 | Game 4 | width=70 | Game 5 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Regal FC Barcelona  | 3 – 1 | 68 – 61 | 63 – 70 | 84 – 73 | 84 – 78 | – | ||||||||||
| 2. | Maccabi Tel Aviv  | 1 – 3 |  Partizan Belgrade | 77 – 85 | 98 – 78 | 73 – 81 | 66 – 76 | – | |||||||||
| 3. | CSKA Moscow  | 3 – 1 | 86 – 63 | 83 – 63 | 53 – 66 | 74 – 70 | – | ||||||||||
| 4. | Olympiacos Piraeus  | 3 – 1 | 83 – 79 | 90 – 73 | 78 – 81 | 86 – 70 | – |