* Radical left, conservative right neck and neck
* Left threatening to tear up terms of bailout
* Result could push Greece to leave the euro
ATHENS, June 16 (Reuters) - Greeks weighed anger on Saturday at five years of biting recession with a deep fear of being forced from Europe's single currency on the eve of a pivotal election that could send shockwaves through global financial markets.
The vote on Sunday amounts to a referendum on the punishing terms set by international lenders as the price of saving debt-ridden Greece from bankruptcy - tax hikes, job losses and pay cuts that have helped condemn the country to record-breaking recession.
Riding a wave of anger from political obscurity to contender for power, radical leftist SYRIZA leader Alexis Tsipras, 37, is threatening to tear up the bailout deal, saying Europe is bluffing when it threatens to cut Greece loose and risk a broader euro breakup.
On the right, establishment heir and New Democracy leader Antonis Samaras, 61, says that to reject the 130 billion euro ($163.75 billion) bailout deal would force a return to the drachma and even greater economic calamity.
Wrapping up his campaign on Friday night before several thousand supporters waving Greek and EU flags in the capital's central Syntagma square, Samaras said: "We are going into an election to decide the future of Greece and of our children."
The vote is a re-run of a May 6 election that produced stalemate, when anger at the close-knit and often corrupt political clique that has run Greece for years propelled SYRIZA from the political fringe into second place.
"My heart says I should vote for the left, for all the horrible things these (mainstream) politicians have done to us, but my mind says vote for the right, so that Greece does not leave the euro," said part-time teacher Kostas Manitsas, 28.
A SYRIZA victory on Sunday could sow turmoil on global financial markets, just as leaders of the Group of 20 world economic powers gather in Mexico for a meeting dominated by the crisis.
"Tomorrow's vote must not be based on anger but on hope," the liberal left daily Ta Nea implored in an editorial. "It must be based on the Greece of the euro, not the Greece of the drachma."
Greeks say they want to keep the euro, but they do not want the pension, wage and jobs cuts imposed by the bailout package and which have seen living standards plummet and unemployment reach almost 23 percent.
The country's lenders in the European Union and International Monetary Fund say they cannot have one without the other.
"Public opinion polls, as well as the May 6 vote, show that those who want the euro overwhelmingly outnumber those who reject it or are willing to sacrifice it for their own party-political purposes," wrote the centre-left daily Ethnos.
Opinion polls published until a ban two weeks ago put the two parties almost neck and neck. Neither is expected to win outright, triggering coalition talks.
Eurogroup head Jean-Claude Juncker urged Greeks not to turn their backs on the euro, for their own sakes as well as the sake of the 17-member currency union, with the far larger economies of Spain and Italy also on the ropes.
"If the radical left wins - which cannot be ruled out - the consequences for the currency union are unforeseeable," Juncker, head of the group of euro zone finance ministers, told Austrian paper Kurier.
"We will have to speak to any government. I can only warn everyone against leaving the currency union. The internal cohesion of the euro zone would be in danger."