Greece's prime minister-elect Kyriakos Mitsotakis on Sunday said his country will emerge "proudly" from a "painful" era after his conservative party won a general election by a landslide.

"The country proudly raises its head again," he said in a televised address as early results showed his New Democracy party beating the leftist Syriza party of Prime Minister Alexis Tsipras by about eight points.

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