Greeks gave Alexis Tsipras' left-wing Syriza party a second chance to deal with the country's debt and push for reforms aimed at modernizing its government and economy, the Associated Press reported.
41-year-old Tsipras retained a coalition partnership with the small right-wing Independent Greeks, and was due to formally be handed the mandate to form a government later Monday.
Tsipras' party had 35.5 percent, with more than 99.5 percent of votes counted early Monday, while the center-right New Democracy trailed with 28.1 percent.
More than four in 10 Greeks stayed away from Sunday's poll, and 7 percent of votes went to the third-place Golden Dawn.