Iran's re-engagement with the world at stake in Friday presidential vote

Iranian Presidential candidate Ebrahim Raisi speaks during a campaign meeting at the Mosalla mosque in Tehran, Iran, May 16, 2017. REUTERS/TIMA

ANKARA (Reuters) - Iranians vote for president on Friday in a contest likely to determine whether Tehran's re-engagement with the world stalls or quickens, although whatever the outcome no change is expected to its revolutionary system of conservative clerical rule.

Seeking a second term, pragmatist President Hassan Rouhani, 68, remains the narrow favourite, but hardline rivals have hammered him over his failure to boost an economy weakened by decades of sanctions.