With Iran's conservative camp divided, reformists were confident of a good showing by the moderate cleric they back in Friday's presidential vote as they seek to avenge the disputed re-election of Mahmoud Ahmadinejad four years ago.
Thanks to a late surge of support, cleric Hassan Rowhani has emerged as one of the front-runners in the poll and has a real chance of forcing a run-off against the conservatives, analysts say.
The support came after the moderate and reformist camps this week joined ranks behind 64-year-old Rowhani after pressurising the sole reformist candidate, Mohammad Reza Aref, to withdraw from the race.
Infographic: Who will be Iran's new president? (Design by Farwa Rizwan/Al Arabiya English)