Papastathopoulos and Szczesny both saw red in a thrilling first match of Euro 2012.
Warsaw: Dimitris Salpigidis earned Greece a 1-1 draw with co-host Poland on Friday in the opening match of the European Championship.
The substitute striker knocked in a loose ball in the 51st minute, only six minutes after coming on at halftime.
Robert Lewandowski had given Poland the lead by heading in a goal in the 17th minute.
Both teams finished with 10 men, and Greece missed a chance to take a lead when Giorgos Karagounis missed a late penalty after Poland goalkeeper Wojciech Szczesny was sent off for taking down Salpigidis in the area in the 69th.
Greece defender Sokratis Papastathopoulos was the first to go, picking up yellow cards in the 35th and 44th.
Both teams now have one point in Group A, which also includes Russia and the Czech Republic.