Greek opinion poll shows pro-bailout party ahead ATHENS (Reuters) - Greece's conservative New Democracy party, which backs the country's international bailout, has a slight lead over the leftist SYRIZA, which opposes it, an opinion poll showed on Saturday ahead of a June 17 election. Parties supporting and opposing Greece's international bailout are running neck-and-neck ahead of next month's repeat national election, which could determine the country's future in the euro zone. New Democracy was backed by 23.3 percent of respondents while SYRIZA scored 22 percent, according to the survey by pollster MRB for weekly newspaper Real News. The result was tweeted by the newspaper ahead of its publication without further details. Three polls published on Friday also showed the two parties in a close race. Of three surveys, two put SYRIZA ahead but two showed gaps of less than 2.2 percentage points between the two contenders. Greek election rules give the party that comes first an automatic bonus of 50 seats in the 300-seat parliament, so that even a slim advantage could play a decisive role in determining which party forms the next government. Greece was forced to call the new June 17 vote after an election on May 6 left parliament divided evenly between groups of parties that support and oppose the austerity conditions attached to a 130 billion euro bailout agreed with the European Union and International Monetary Fund in March. The failure of the two parties that dominated Greece for decades - New Democracy and PASOK - to win a pro-bailout majority, and the success of SYRIZA party which came second, have sent shockwaves through Europe. Polls since the May 6 election have shown SYRIZA, New Democracy and PASOK improving their performance at the expense of smaller parties. Reporting by Harry Papachristou