RIO DE JANEIRO, Aug 18 (Reuters) - The Brazilian real gained early on Monday as an opinion poll showed President Dilma Rousseff, criticized by investors for her interventionist policies, is unlikely to win re-election outright in Oct. 3 elections.
Brazilian markets are likely to remain volatile, however, as the poll also showed increased uncertainty about who is likely to face Rousseff in a second-round runoff - market-favorite Aecio Neves or environmentalist Marina Silva.
The real gained 0.2 percent early on Monday after rising as much as 0.5 percent in the first minutes of trading. Easing geopolitical tensions related to the Ukraine-Russia crisis also contributed to gains in the real as well as in other emerging market currencies. (Reporting by Walter Brandimarte Editing by W Simon)