Olympiakos narrowed the gap separating it from Super League leader Panathinaikos to just two points on Sunday.
The Reds scored a precious 2-0 win at PAOK thanks to goals by Djamel Abdoun and Kevin Mirallas in the first half, making the most of Panathinaikos?s surprise loss at Livadia on Saturday evening.
Levadiakos beat the Greens 1-0, courtesy of a Paschalis Melissas header seven minutes from time that brought about the second loss this season for the league leaders, whose fans engaged in clashes with police afterward.
AEK moved above PAOK to third through a 1-0 home win over Panionios. Pantelis Kafes was on target for AEK in the 27th minute.
In other games, PAS Giannina defeated host Kerkyra 2-1, Asteras Tripolis downed visiting Doxa Dramas 1-0, Panetolikos drew 1-1 with Atromitos, OFI took the Iraklio derby with a 1-0 win over Ergotelis, and Aris won 2-0 at Xanthi.