Roivas' Reform Party, which has stressed fears of Russian interference in Estonia after Moscow annexed Ukraine's Crimea region last year, led with 26 percent support in a final TNS EMOR poll on Friday against 22 for the center-left Center Party.
A free-marketeer and the youngest European Union leader at 35, Roivas is likely to be best placed to form a new coalition, even if the Center Party wins the most votes.