[5] The top six teams from the top-tier level Greek Basket League's 2019–20 season, gained an automatic bye to the 2020–21 Greek Cup quarterfinals.

While the seven lower-placed teams from the 2019–20 Greek Basket League season also gained an automatic bye to the 2020–21 Greek Cup phase two, competing for two quarterfinals spots with phase one winners.

All sixteen teams from the second-tier level Greek A2 Basket League's 2019–20 season will start from phase one, competing for one spot in phase two of the cup.

Referees: Anastopoulos, Koromilas, Manos Panathinaikos OPAP (Kattash): Mack, Papagiannis 6, Bochoridis, Papapetrou 25, Hezonja 18, Diplaros, Kaselakis, White 6, Mitoglou 17, Bentil 3, Sant-Roos 16.

Promitheas Patras (Giatras): Agbelese 2, Jerai Grant 18, Clavell 23, Lountzis 9, Agravanis D. 5, Agravanis G. 5, Ford, Christodoulou, Jerian Grant 17, Giannopoulos, Bazinas, Tanoulis.