ATHENS—Greeks are expected to elect a pro-business government Sunday, but the prospects for the country’s crisis-scarred economy remain grim.

After suffering the deepest depression in a developed country since the 1930s, Greece’s economy is still 24% smaller than in 2007, before the financial crisis began, according to national statistics figures. Its creditors, led by Germany, continue to insist that the country run big budget surpluses to service the bailout loans made in recent years.

Creditors’...