Former Greek premier Alexis Tsipras's leftist Syriza party's lead in the polls is narrowing, a survey showed on yesterday, suggesting momentum may be shifting towards the opposition as the country counts down to a snap election. The gap between Syriza and the conservative New Democracy party dipped to just 1.8 percentage points, with increasing numbers criticising Tsipras's decision to call the vote, according to the MRB poll for weekly Agora newspaper. The election, confirmed by presidential decree on Friday for Sept. 20, was building up to be "a thriller from a polling viewpoint," the paper said. The MRB poll gave Syriza party 24.6 percent against 22.8 percent for New Democracy.