Madrid: Spain's right romped toward a thumping victory in general elections on Sunday, which would complete a clean-sweep rejection of governments in the crisis-torn euro zone nations.

Bowed by a 21.5 percent jobless rate, economic stagnation and deep spending cuts, the 36-million-strong Spanish electorate was set to hand the right a crushing win over the ruling Socialists.

Opposition Popular Party leader Mariano Rajoy has a lead of about 15 percentage points, latest polls showed, sufficient to secure an absolute majority in parliament and a free hand to reform.

Spain would thus become the last of the so-called periphery euro zone nations to ditch its government after the debt storm toppled rulers of Ireland, Portugal, Greece and Italy.

"The choice which Spanish voters make Sunday is of course important for Spain. It is also important for France, for the euro and for Europe," France's leading daily Le Monde said in an edition devoted to Spain published on Saturday.

Street protests and a debt market tempest chased the ruling Socialists up to the last moment before the vote.

Though considered uncharismatic even by many of his supporters, the 56-year-old Rajoy has galvanised support by promising a break from the past to fix the economy and create jobs.

Rajoy has given few details of his austerity plans but analysts say on Sunday's winner must quickly impose reforms and cut costs to reassure world markets about Spain's determination to repay its debts.

Spain's risk premium -- the extra interest rate investors demand over safe-haven German debt -- shot to a euro-era high of more than 500 basis points in the days ahead of the vote.

"If the markets think the new government is not going to act with the necessary determination, they will raise the risk premium further," said Daniel Pingarron, analyst at trading house IG Markets.