Peruvian Ambassador to China, Juan Carlos Capuñay Photo: Courtesy of the Peruvian Embassy in Beijing

Peruvian socialist Pedro ­Castillo is in pole position to win the presidency in a second-round ballot set for June, according to a survey by pollster Ipsos Peru on Sunday that showed him garnering 42 percent against 31 percent for right-wing rival Keiko Fujimori.

It was the first opinion poll since the first round of the ­election in April, when the socialist candidate's surprise win sent shudders through markets in the world´s second biggest copper producer.

Castillo, a previously little-known union leader and teacher who rode a horse to vote in the first round elections on April 11, has said he plans to rewrite the Constitution and give the state more control over some industries, includ-ing the sprawling mining sector.

Fujimori, 45, advocates a free market economic model to bolster growth and attract new business.

Already suffering from a battered economy and an ailing political system, Peruvians are on edge ahead of the runoff on June 6 between two candidates from different ends of the political spectrum.

While often politically turbulent, Peru has been one of the resilient markets in Latin America in recent years, attracting international money managers into its bonds and sol currency.

Of the 1,204 people polled by Ipsos Peru between Thursday and Friday, 16 percent said they would not vote for either candidate, and 11 percent had yet to decide. 

The poll has a margin of ­error of +/- 2.8 percent.