Electoral authority shows right-wing Keiko Fujimori with a marginal advantage over Roberto Sánchez.

Progressive candidate Roberto Sánchez and right-wing Keiko Fujimori will compete in a race that appears up for grabs

Polls opened in Peru's presidential runoff Sunday, with crime and political instability dominating a race to choose the country's ninth leader in a decade.

Electoral authority shows right-wing Keiko Fujimori with a marginal advantage over Roberto Sánchez.