European Parliament lawmaker Nikos Androulakis has won the first round of the race for the leadership of the center-left Movement for Change (KINAL) party.
Androulakis, 42, will face former Prime Minister George Papandreou, 69, in a runoff next Sunday.
With over 90% of the votes counted, Androulakis was leading Papadreou, 37.06% to 27.78%. MP Andreas Loverdos, 65, was third with 25.95%. Loverdos conceded late Sunday.
KINAL officials said the turnout of party members and friends reached nearly 268,000, more than the 217,000 that voted in the last leadership contest, in 2017.