A poll by University of Macedonia for Skai television showed that Syriza and New Democracy would each get 27 percent of the vote. A second survey by MRB for Star television put them both on 29.6 percent.
A third poll by Metron Analysis poll earlier on Friday was the second this week to show the conservative party in the lead.
Tsipras came to power in January promising to reverse years of austerity. But he resigned last month after a rebellion in his party, seeking a fresh mandate to implement the bailout he clinched after seven months of often acrimonious negotiations with Greece`s European and International Monetary Fund creditors.
Just a few weeks ago, a Syriza election victory had appeared almost certain as Greeks lauded the charismatic and youthful Tsipras for taking a hard-line stance with the creditors that he was eventually forced to give way on.
Undecided voters ranged between 10.5 and 15 percent in the three polls.
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