As the hours wind down until Election Day voters cast their ballots, two new polls in the battle for the U.S. Senate in Massachusetts indicate an increasingly tight race.

The University of Massachusetts/Lowell-Boston Herald poll showed Republican Sen. Scott Brown with a one point advantage over Democrat Elizabeth Warren, 49% to Warren’s 48%, while a survey from the Western New England University Polling Institute showed Warren up four points over Brown, 50%-46%.

Both candidates’ leads in the respective surveys fall well within the polls’ sampling errors.

While the University of Massachusetts poll shows Brown with a small advantage over Warren other recent surveys over the past few weeks gave Warren a single digit advantage.

Brown, a freshman senator, is defending his seat against Warren, a Harvard University Law professor and former Obama administration official who helped to create the Consumer Financial Protection Bureau.

The University of Massachusetts/Lowell-Boston Herald poll was conducted from October 31 to November 3 among 956 Massachusetts registered voters and 800 likely voters. The survey’s sampling error is plus or minus 4.1 percentage points.

The New England University poll was conducted from October 26 through November 1 among 535 likely voters and has a sampling error of plus or minus 4 percentage points.

— CNN Political Editor Paul Steinhauser contributed to this report.