Parties supporting Greece's bailout agreement won parliamentary majority in Sunday's general election, with coalition talks set to start on Monday.
New Democracy won 29.7% of the vote, SYRIZA was backed by 26.9% and PASOK collected 12.3% of the vote, according to interior ministry data based on 97% of the ballots counted.
As the elections winner gets a 50-seat bonus, New Democracy and PASOK will have 162 seats in the 300-seat parliament.
Speaking upon the release of the first official results, New Democracy leader Antonis Samaras called for broad support.
"There is no time to waste," Reuters quoted Samaras as saying. "A national salvation government must bring economic growth and reassure Greeks the worst is over."
For his part, SYRIZA leader Alexis Tsipras stressed his party would fight on against the bailout and take power sooner or later.
The elections result boosted the euro to a one-month high.