An opinion poll published in To Vima weekly on Sunday gives SYRIZA a lead of almost 1 percentage point over New Democracy.
According to the Kapa Research survey, SYRIZA gathers support of 22.5 percent compared to 21.7 percent for New Democracy.
Golden Dawn is in third place with 7.5 percent, followed by the Communist Party 5.8 percent, PASOK on 5.6 percent and Independent Greeks on 4 percent.
Democratic Left did not pass the 3-percent threshold for entering Parliament, gathering just 2.8 percent. Almost 20 percent of voters were undecided.