Ghana international Quincy Owusu-Abeyie scored on Sunday to propel Panathinaikos to the top of the Greek league.
Following defeat to champions, Olympiakos, Panathinaikos' 1-0 victory against Atromitos sends them top of the league by two points.
Quincy struck the winner in the 72nd-minute as Panathinaikos now has 42 points and a game in hand on Olympiakos, which has 40.