MOSCOW (Reuters) - Kremlin ally Sergei Sobyanin won 57.7 won percent of the votes in a Moscow mayoral election on Sunday, enough to secure victory without a second-round runoff, initial partial results showed.

The results, after 4 percent of votes were counted, put opposition leader Alexei Navalny on 21.6 percent, RIA news agency said.

Two exit polls also suggested Sobyanin, an ally of President Vladimir Putin, would secure victory in the first round although Navalny's campaign team said its own exit polls indicated he had not crossed the threshold needed for outright victory.

(Reporting by Gabriela Baczynska)