Challenger Alejandro Garcia Padilla's lead over incumbent Puerto Rican Gov. Luis Fortuño is down to two percentage points, according to a survey released on Tuesday.
With less than a month before the election, a survey by San Juan's El Nuevo Dia newspaper shows Garcia Padilla, of the main opposition PPD, with an advantage of 41 percent to 39 percent.
The challenger led Fortuño by 41 percent to 36 percent in August.
The latest survey found the other three candidates with support in single digits.
Both main parties reacted immediately after the poll's publication and PPD general secretary Victory Suarez said that his party was carrying out other surveys that show Garcia Padilla has an advantage over the current governor that is even larger than that indicated in El Nuevo Dia.
Meanwhile, the campaign director for the governing PNP, Angel Cintron, said that his party had conducted private polls that give the advantage to the incumbent.
The latest survey also provided figures about the other post up for grabs on Nov. 6, that of Puerto Rico's non-voting representative in the U.S. Congress.
The El Nuevo Dia survey found that 45 percent of those questioned favored the current man in the post, the PNP's Pedro Pierluisi, compared to 39 percent who said they would support Rafael Cox Alomar of the PPD.
The survey was carried out Oct. 2-4 via personal interviews of 1,000 registered voters throughout the island and has an error margin of plus/minus 3 percent.
The Nov. 6 ballot will also include a non-binding referendum on whether the island should remain a U.S. commonwealth or seek full statehood.
The PNP favors statehood, while the PPD wants an enhanced form of commonwealth status. EFE