Panionios edged out Olympiacos in a close win on Sunday, 0x1, on matchday 22. To this matchday, Paulo Bento's team came from a defeat, and Vladan Milojevic's team came from three wins.
With 1 minutes on the clock, Giorgos Masouras struck the only goal of the game.
After the result Olympiacos are 1st in the table, with 51 points, while Panionios sit 2nd place, with 44 points. Next up, Nea Smirni's team will play at home against AEK, whilst Piraeus's team visit PAOK.